diff --git a/client.c b/client.c
index 7d997a7e..9c493dfa 100644
--- a/client.c
+++ b/client.c
@@ -352,9 +352,10 @@ client_main(int argc, char **argv, int flags)
 void
 client_send_identify(int flags)
 {
-	const char	*s;
+	const char	 *s;
 	char		**ss;
-	int		 fd;
+	int		  fd;
+	pid_t		  pid;
 
 	client_write_one(MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
 
@@ -374,6 +375,9 @@ client_send_identify(int flags)
 		fatal("dup failed");
 	client_write_one(MSG_IDENTIFY_STDIN, fd, NULL, 0);
 
+	pid = getpid();
+	client_write_one(MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
+
 	for (ss = environ; *ss != NULL; ss++)
 		client_write_one(MSG_IDENTIFY_ENVIRON, -1, *ss, strlen(*ss) + 1);
 
diff --git a/cmd-break-pane.c b/cmd-break-pane.c
index a1da0a3a..c7af7865 100644
--- a/cmd-break-pane.c
+++ b/cmd-break-pane.c
@@ -32,8 +32,8 @@ enum cmd_retval	 cmd_break_pane_exec(struct cmd *, struct cmd_q *);
 
 const struct cmd_entry cmd_break_pane_entry = {
 	"break-pane", "breakp",
-	"dPF:t:", 0, 0,
-	"[-dP] [-F format] " CMD_TARGET_PANE_USAGE,
+	"dPF:s:t:", 0, 0,
+	"[-dP] [-F format] " CMD_SRCDST_PANE_USAGE,
 	0,
 	cmd_break_pane_exec
 };
@@ -48,13 +48,19 @@ cmd_break_pane_exec(struct cmd *self, struct cmd_q *cmdq)
 	struct window		*w;
 	char			*name;
 	char			*cause;
-	int			 base_idx;
+	int			 idx;
 	struct format_tree	*ft;
 	const char		*template;
 	char			*cp;
 
-	if ((wl = cmd_find_pane(cmdq, args_get(args, 't'), &s, &wp)) == NULL)
+	if ((wl = cmd_find_pane(cmdq, args_get(args, 's'), &s, &wp)) == NULL)
 		return (CMD_RETURN_ERROR);
+	if ((idx = cmd_find_index(cmdq, args_get(args, 't'), &s)) == -2)
+		return (CMD_RETURN_ERROR);
+	if (idx != -1 && winlink_find_by_index(&s->windows, idx) != NULL) {
+		cmdq_error(cmdq, "index %d already in use", idx);
+		return (CMD_RETURN_ERROR);
+	}
 
 	if (window_count_panes(wl->window) == 1) {
 		cmdq_error(cmdq, "can't break with only one pane");
@@ -76,8 +82,9 @@ cmd_break_pane_exec(struct cmd *self, struct cmd_q *cmdq)
 	free(name);
 	layout_init(w, wp);
 
-	base_idx = options_get_number(&s->options, "base-index");
-	wl = session_attach(s, w, -1 - base_idx, &cause); /* can't fail */
+	if (idx == -1)
+		idx = -1 - options_get_number(&s->options, "base-index");
+	wl = session_attach(s, w, idx, &cause); /* can't fail */
 	if (!args_has(self->args, 'd'))
 		session_select(s, wl->idx);
 
diff --git a/cmd-join-pane.c b/cmd-join-pane.c
index 3d2a04b2..c384631c 100644
--- a/cmd-join-pane.c
+++ b/cmd-join-pane.c
@@ -35,7 +35,7 @@ enum cmd_retval	 join_pane(struct cmd *, struct cmd_q *, int);
 const struct cmd_entry cmd_join_pane_entry = {
 	"join-pane", "joinp",
 	"bdhvp:l:s:t:", 0, 0,
-	"[-bdhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
+	"[-bdhv] [-p percentage|-l size] " CMD_SRCDST_PANE_USAGE,
 	0,
 	cmd_join_pane_exec
 };
@@ -43,7 +43,7 @@ const struct cmd_entry cmd_join_pane_entry = {
 const struct cmd_entry cmd_move_pane_entry = {
 	"move-pane", "movep",
 	"bdhvp:l:s:t:", 0, 0,
-	"[-bdhv] [-p percentage|-l size] [-s src-pane] [-t dst-pane]",
+	"[-bdhv] [-p percentage|-l size] " CMD_SRCDST_PANE_USAGE,
 	0,
 	cmd_join_pane_exec
 };
diff --git a/cmd-move-window.c b/cmd-move-window.c
index e765b625..b15df4f6 100644
--- a/cmd-move-window.c
+++ b/cmd-move-window.c
@@ -30,7 +30,7 @@ enum cmd_retval	 cmd_move_window_exec(struct cmd *, struct cmd_q *);
 
 const struct cmd_entry cmd_move_window_entry = {
 	"move-window", "movew",
-	"dkrs:t:", 0, 0,
+	"adkrs:t:", 0, 0,
 	"[-dkr] " CMD_SRCDST_WINDOW_USAGE,
 	0,
 	cmd_move_window_exec
@@ -38,7 +38,7 @@ const struct cmd_entry cmd_move_window_entry = {
 
 const struct cmd_entry cmd_link_window_entry = {
 	"link-window", "linkw",
-	"dks:t:", 0, 0,
+	"adks:t:", 0, 0,
 	"[-dk] " CMD_SRCDST_WINDOW_USAGE,
 	0,
 	cmd_move_window_exec
@@ -72,6 +72,15 @@ cmd_move_window_exec(struct cmd *self, struct cmd_q *cmdq)
 	kflag = args_has(self->args, 'k');
 	dflag = args_has(self->args, 'd');
 	sflag = args_has(self->args, 's');
+
+	if (args_has(self->args, 'a')) {
+		s = cmd_find_session(cmdq, args_get(args, 't'), 0);
+		if (s == NULL)
+			return (CMD_RETURN_ERROR);
+		if ((idx = winlink_shuffle_up(s, s->curw)) == -1)
+			return (CMD_RETURN_ERROR);
+	}
+
 	if (server_link_window(src, wl, dst, idx, kflag, !dflag,
 	    &cause) != 0) {
 		cmdq_error(cmdq, "can't link window: %s", cause);
diff --git a/cmd-new-window.c b/cmd-new-window.c
index c05a0ce8..9cead449 100644
--- a/cmd-new-window.c
+++ b/cmd-new-window.c
@@ -51,7 +51,7 @@ cmd_new_window_exec(struct cmd *self, struct cmd_q *cmdq)
 	struct winlink		*wl;
 	const char		*cmd, *path, *template;
 	char		       **argv, *cause, *cp;
-	int			 argc, idx, last, detached, cwd, fd = -1;
+	int			 argc, idx, detached, cwd, fd = -1;
 	struct format_tree	*ft;
 	struct environ_entry	*envent;
 
@@ -59,24 +59,10 @@ cmd_new_window_exec(struct cmd *self, struct cmd_q *cmdq)
 		wl = cmd_find_window(cmdq, args_get(args, 't'), &s);
 		if (wl == NULL)
 			return (CMD_RETURN_ERROR);
-		idx = wl->idx + 1;
-
-		/* Find the next free index. */
-		for (last = idx; last < INT_MAX; last++) {
-			if (winlink_find_by_index(&s->windows, last) == NULL)
-				break;
-		}
-		if (last == INT_MAX) {
+		if ((idx = winlink_shuffle_up(s, wl)) == -1) {
 			cmdq_error(cmdq, "no free window indexes");
 			return (CMD_RETURN_ERROR);
 		}
-
-		/* Move everything from last - 1 to idx up a bit. */
-		for (; last > idx; last--) {
-			wl = winlink_find_by_index(&s->windows, last - 1);
-			server_link_window(s, wl, s, last, 0, 0, NULL);
-			server_unlink_window(s, wl);
-		}
 	} else {
 		idx = cmd_find_index(cmdq, args_get(args, 't'), &s);
 		if (idx == -2)
diff --git a/cmd-queue.c b/cmd-queue.c
index 61b14147..af987f59 100644
--- a/cmd-queue.c
+++ b/cmd-queue.c
@@ -25,6 +25,8 @@
 
 #include "tmux.h"
 
+enum cmd_retval	cmdq_continue_one(struct cmd_q *);
+
 /* Create new command queue. */
 struct cmd_q *
 cmdq_new(struct client *c)
@@ -160,14 +162,39 @@ cmdq_append(struct cmd_q *cmdq, struct cmd_list *cmdlist, struct mouse_event *m)
 		item->mouse.valid = 0;
 }
 
+/* Process one command. */
+enum cmd_retval
+cmdq_continue_one(struct cmd_q *cmdq)
+{
+	struct cmd	*cmd = cmdq->cmd;
+	enum cmd_retval	 retval;
+	char		 tmp[1024];
+	int		 flags = !!(cmd->flags & CMD_CONTROL);
+
+	cmd_print(cmd, tmp, sizeof tmp);
+	log_debug("cmdq %p: %s", cmdq, tmp);
+
+	cmdq->time = time(NULL);
+	cmdq->number++;
+
+	cmdq_guard(cmdq, "begin", flags);
+
+	retval = cmd->entry->exec(cmd, cmdq);
+
+	if (retval == CMD_RETURN_ERROR)
+		cmdq_guard(cmdq, "error", flags);
+	else
+		cmdq_guard(cmdq, "end", flags);
+	return (retval);
+}
+
 /* Continue processing command queue. Returns 1 if finishes empty. */
 int
 cmdq_continue(struct cmd_q *cmdq)
 {
 	struct cmd_q_item	*next;
 	enum cmd_retval		 retval;
-	int			 empty, flags;
-	char			 s[1024];
+	int			 empty;
 
 	cmdq->references++;
 	notify_disable();
@@ -184,23 +211,7 @@ cmdq_continue(struct cmd_q *cmdq)
 
 	do {
 		while (cmdq->cmd != NULL) {
-			cmd_print(cmdq->cmd, s, sizeof s);
-			log_debug("cmdq %p: %s (client %d)", cmdq, s,
-			    cmdq->client != NULL ? cmdq->client->ibuf.fd : -1);
-
-			cmdq->time = time(NULL);
-			cmdq->number++;
-
-			flags = !!(cmdq->cmd->flags & CMD_CONTROL);
-			cmdq_guard(cmdq, "begin", flags);
-
-			retval = cmdq->cmd->entry->exec(cmdq->cmd, cmdq);
-
-			if (retval == CMD_RETURN_ERROR)
-				cmdq_guard(cmdq, "error", flags);
-			else
-				cmdq_guard(cmdq, "end", flags);
-
+			retval = cmdq_continue_one(cmdq);
 			if (retval == CMD_RETURN_ERROR)
 				break;
 			if (retval == CMD_RETURN_WAIT)
@@ -209,7 +220,6 @@ cmdq_continue(struct cmd_q *cmdq)
 				cmdq_flush(cmdq);
 				goto empty;
 			}
-
 			cmdq->cmd = TAILQ_NEXT(cmdq->cmd, qentry);
 		}
 		next = TAILQ_NEXT(cmdq->item, qentry);
diff --git a/format.c b/format.c
index 6eeb028e..59ef598c 100644
--- a/format.c
+++ b/format.c
@@ -272,6 +272,7 @@ format_create_status(int status)
 			*ptr = '\0';
 		format_add(ft, "host_short", "%s", host);
 	}
+	format_add(ft, "pid", "%ld", (long) getpid());
 
 	return (ft);
 }
@@ -338,7 +339,7 @@ format_find(struct format_tree *ft, const char *key)
 		case OPTIONS_STRING:
 			return (o->str);
 		case OPTIONS_NUMBER:
-			snprintf(s, sizeof s, "%lld", o->num);
+			xsnprintf(s, sizeof s, "%lld", o->num);
 			return (s);
 		case OPTIONS_STYLE:
 			return (style_tostring(&o->style));
@@ -679,7 +680,7 @@ format_defaults_session(struct format_tree *ft, struct session *s)
 	RB_FOREACH (wl, winlinks, &s->windows) {
 		if ((wl->flags & WINLINK_ALERTFLAGS) == 0)
 			continue;
-		snprintf(tmp, sizeof tmp, "%u", wl->idx);
+		xsnprintf(tmp, sizeof tmp, "%u", wl->idx);
 
 		if (*alerts != '\0')
 			strlcat(alerts, ",", sizeof alerts);
@@ -704,6 +705,7 @@ format_defaults_client(struct format_tree *ft, struct client *c)
 	if (ft->s == NULL)
 		ft->s = c->session;
 
+	format_add(ft, "client_pid", "%ld", (long) c->pid);
 	format_add(ft, "client_height", "%u", c->tty.sy);
 	format_add(ft, "client_width", "%u", c->tty.sx);
 	if (c->tty.path != NULL)
@@ -748,6 +750,7 @@ void
 format_defaults_window(struct format_tree *ft, struct window *w)
 {
 	char	*layout;
+	time_t	 t;
 
 	ft->w = w;
 
@@ -756,6 +759,10 @@ format_defaults_window(struct format_tree *ft, struct window *w)
 	else
 		layout = layout_dump(w->layout_root);
 
+	t = w->activity_time.tv_sec;
+	format_add(ft, "window_activity", "%lld", (long long) t);
+	format_add(ft, "window_activity_string", "%s", format_time_string(t));
+
 	format_add(ft, "window_id", "@%u", w->id);
 	format_add(ft, "window_name", "%s", w->name);
 	format_add(ft, "window_width", "%u", w->sx);
@@ -873,8 +880,7 @@ format_defaults_pane(struct format_tree *ft, struct window_pane *wp)
 	format_add(ft, "pane_synchronized", "%d",
 	    !!options_get_number(&wp->window->options, "synchronize-panes"));
 
-	if (wp->tty != NULL)
-		format_add(ft, "pane_tty", "%s", wp->tty);
+	format_add(ft, "pane_tty", "%s", wp->tty);
 	format_add(ft, "pane_pid", "%ld", (long) wp->pid);
 	if ((cwd = osdep_get_cwd(wp->fd)) != NULL)
 		format_add(ft, "pane_current_path", "%s", cwd);
diff --git a/input.c b/input.c
index 7a371c62..d1ff17fe 100644
--- a/input.c
+++ b/input.c
@@ -20,6 +20,7 @@
 
 #include <stdlib.h>
 #include <string.h>
+#include <time.h>
 
 #include "tmux.h"
 
@@ -849,6 +850,9 @@ input_parse(struct window_pane *wp)
 	wp->window->flags |= WINDOW_ACTIVITY;
 	wp->window->flags &= ~WINDOW_SILENCE;
 
+	if (gettimeofday(&wp->window->activity_time, NULL) != 0)
+		fatal("gettimeofday failed");
+
 	/*
 	 * Open the screen. Use NULL wp if there is a mode set as don't want to
 	 * update the tty.
diff --git a/job.c b/job.c
index 74b316ed..ff21b3b6 100644
--- a/job.c
+++ b/job.c
@@ -99,6 +99,8 @@ job_run(const char *cmd, struct session *s, int cwd,
 	close(out[1]);
 
 	job = xmalloc(sizeof *job);
+	job->state = JOB_RUNNING;
+
 	job->cmd = xstrdup(cmd);
 	job->pid = pid;
 	job->status = 0;
@@ -166,14 +168,13 @@ job_callback(unused struct bufferevent *bufev, unused short events, void *data)
 
 	log_debug("job error %p: %s, pid %ld", job, job->cmd, (long) job->pid);
 
-	if (job->pid == -1) {
+	if (job->state == JOB_DEAD) {
 		if (job->callbackfn != NULL)
 			job->callbackfn(job);
 		job_free(job);
 	} else {
 		bufferevent_disable(job->event, EV_READ);
-		close(job->fd);
-		job->fd = -1;
+		job->state = JOB_CLOSED;
 	}
 }
 
@@ -185,10 +186,12 @@ job_died(struct job *job, int status)
 
 	job->status = status;
 
-	if (job->fd == -1) {
+	if (job->state == JOB_CLOSED) {
 		if (job->callbackfn != NULL)
 			job->callbackfn(job);
 		job_free(job);
-	} else
+	} else {
 		job->pid = -1;
+		job->state = JOB_DEAD;
+	}
 }
diff --git a/server-client.c b/server-client.c
index 27efc57d..c9c0c3ef 100644
--- a/server-client.c
+++ b/server-client.c
@@ -1053,6 +1053,7 @@ server_client_msg_dispatch(struct client *c)
 		case MSG_IDENTIFY_CWD:
 		case MSG_IDENTIFY_STDIN:
 		case MSG_IDENTIFY_ENVIRON:
+		case MSG_IDENTIFY_CLIENTPID:
 		case MSG_IDENTIFY_DONE:
 			server_client_msg_identify(c, &imsg);
 			break;
@@ -1227,6 +1228,11 @@ server_client_msg_identify(struct client *c, struct imsg *imsg)
 		if (strchr(data, '=') != NULL)
 			environ_put(&c->environ, data);
 		break;
+	case MSG_IDENTIFY_CLIENTPID:
+		if (datalen != sizeof c->pid)
+			fatalx("bad MSG_IDENTIFY_CLIENTPID size");
+		memcpy(&c->pid, data, sizeof c->pid);
+		break;
 	default:
 		break;
 	}
diff --git a/tmux.1 b/tmux.1
index f3eeabcc..20754551 100644
--- a/tmux.1
+++ b/tmux.1
@@ -408,14 +408,15 @@ An
 pattern which is matched against the session name.
 .El
 .Pp
-If the session name is prefixed with a
-.Ql = : ,
+If the session name is prefixed with an
+.Ql = ,
 only an exact match is accepted (so
 .Ql =mysess
 will only match exactly
 .Ql mysess ,
 not
 .Ql mysession ) .
+.Pp
 If a single session is found, it is used as the target session; multiple matches
 produce an error.
 If a session is omitted, the current session is used if available; if no
@@ -1237,12 +1238,14 @@ Commands related to windows and panes are as follows:
 .It Xo Ic break-pane
 .Op Fl dP
 .Op Fl F Ar format
-.Op Fl t Ar target-pane
+.Op Fl s Ar src-pane
+.Op Fl t Ar dst-pane
 .Xc
 .D1 (alias: Ic breakp )
 Break
-.Ar target-pane
-off from its containing window to make it the only pane in a new window.
+.Ar src-pane
+off from its containing window to make it the only pane in
+.Ar dst-window .
 If
 .Fl d
 is given, the new window does not become the current window.
@@ -1548,7 +1551,7 @@ If no
 .Ar target-session
 is specified, select the last window of the current session.
 .It Xo Ic link-window
-.Op Fl dk
+.Op Fl adk
 .Op Fl s Ar src-window
 .Op Fl t Ar dst-window
 .Xc
@@ -1562,6 +1565,10 @@ If
 is specified and no such window exists, the
 .Ar src-window
 is linked there.
+With
+.Fl a ,
+the window is moved to the next index up (following windows
+are moved if necessary).
 If
 .Fl k
 is given and
@@ -1627,7 +1634,7 @@ and
 .Ar dst-pane
 may belong to the same window.
 .It Xo Ic move-window
-.Op Fl rdk
+.Op Fl ardk
 .Op Fl s Ar src-window
 .Op Fl t Ar dst-window
 .Xc
@@ -3357,6 +3364,7 @@ The following variables are available, where appropriate:
 .It Li "client_created_string" Ta "" Ta "String time client created"
 .It Li "client_height" Ta "" Ta "Height of client"
 .It Li "client_last_session" Ta "" Ta "Name of the client's last session"
+.It Li "client_pid" Ta "" Ta "PID of client process"
 .It Li "client_prefix" Ta "" Ta "1 if prefix key has been pressed"
 .It Li "client_readonly" Ta "" Ta "1 if client is readonly"
 .It Li "client_session" Ta "" Ta "Name of the client's session"
@@ -3401,6 +3409,7 @@ The following variables are available, where appropriate:
 .It Li "pane_top" Ta "" Ta "Top of pane"
 .It Li "pane_tty" Ta "" Ta "Pseudo terminal of pane"
 .It Li "pane_width" Ta "" Ta "Width of pane"
+.It Li "pid" Ta ""  Ta "Server PID"
 .It Li "scroll_region_lower" Ta "" Ta "Bottom of scroll region in pane"
 .It Li "scroll_region_upper" Ta "" Ta "Top of scroll region in pane"
 .It Li "session_alerts" Ta "" Ta "List of window indexes with alerts"
@@ -3417,6 +3426,8 @@ The following variables are available, where appropriate:
 .It Li "session_name" Ta "#S" Ta "Name of session"
 .It Li "session_width" Ta "" Ta "Width of session"
 .It Li "session_windows" Ta "" Ta "Number of windows in session"
+.It Li "window_activity" Ta "" Ta "Integer time of window last activity"
+.It Li "window_activity_string" Ta "" Ta "String time of window last activity"
 .It Li "window_active" Ta "" Ta "1 if window active"
 .It Li "window_activity_flag" Ta "" Ta "1 if window has activity alert"
 .It Li "window_bell_flag" Ta "" Ta "1 if window has bell"
diff --git a/tmux.h b/tmux.h
index 210826ad..f0fef0d5 100644
--- a/tmux.h
+++ b/tmux.h
@@ -429,6 +429,7 @@ enum msgtype {
 	MSG_IDENTIFY_STDIN,
 	MSG_IDENTIFY_ENVIRON,
 	MSG_IDENTIFY_DONE,
+	MSG_IDENTIFY_CLIENTPID,
 
 	MSG_COMMAND = 200,
 	MSG_DETACH,
@@ -717,6 +718,12 @@ struct options {
 
 /* Scheduled job. */
 struct job {
+	enum {
+		JOB_RUNNING,
+		JOB_DEAD,
+		JOB_CLOSED
+	} state;
+
 	char		*cmd;
 	pid_t		 pid;
 	int		 status;
@@ -895,6 +902,7 @@ struct window {
 	char		*name;
 	struct event	 name_timer;
 	struct timeval	 silence_timer;
+	struct timeval	 activity_time;
 
 	struct window_pane *active;
 	struct window_pane *last;
@@ -1210,6 +1218,7 @@ RB_HEAD(status_out_tree, status_out);
 struct client {
 	struct imsgbuf	 ibuf;
 
+	pid_t		 pid;
 	int		 fd;
 	struct event	 event;
 	int		 retval;
@@ -2161,6 +2170,7 @@ struct window_pane *window_pane_find_right(struct window_pane *);
 void		 window_set_name(struct window *, const char *);
 void		 window_remove_ref(struct window *);
 void		 winlink_clear_flags(struct winlink *);
+int		 winlink_shuffle_up(struct session *, struct winlink *);
 
 /* layout.c */
 u_int		 layout_count_cells(struct layout_cell *);
diff --git a/window.c b/window.c
index 721d0213..fab9949e 100644
--- a/window.c
+++ b/window.c
@@ -294,6 +294,9 @@ window_create1(u_int sx, u_int sy)
 	w->sx = sx;
 	w->sy = sy;
 
+	if (gettimeofday(&w->activity_time, NULL) != 0)
+		fatal("gettimeofday failed");
+
 	options_init(&w->options, &global_w_options);
 	if (options_get_number(&w->options, "automatic-rename"))
 		queue_window_name(w);
@@ -1389,3 +1392,28 @@ winlink_clear_flags(struct winlink *wl)
 		}
 	}
 }
+
+int
+winlink_shuffle_up(struct session *s, struct winlink *wl)
+{
+	int	 idx, last;
+
+	idx = wl->idx + 1;
+
+	/* Find the next free index. */
+	for (last = idx; last < INT_MAX; last++) {
+		if (winlink_find_by_index(&s->windows, last) == NULL)
+			break;
+	}
+	if (last == INT_MAX)
+		return (-1);
+
+	/* Move everything from last - 1 to idx up a bit. */
+	for (; last > idx; last--) {
+		wl = winlink_find_by_index(&s->windows, last - 1);
+		server_link_window(s, wl, s, last, 0, 0, NULL);
+		server_unlink_window(s, wl);
+	}
+
+	return (idx);
+}