diff -r 79bf47074a49 config.mk
--- a/config.mk	Sat Dec 06 16:20:14 2008 +0000
+++ b/config.mk	Thu Dec 11 22:50:24 2008 -0500
@@ -13,6 +13,8 @@
 # Xinerama, un-comment if you want it
 #XINERAMALIBS = -L${X11LIB} -lXinerama
 #XINERAMAFLAGS = -DXINERAMA
+XINERAMALIBS = -L${X11LIB} -lXrandr
+XINERAMAFLAGS = -DXRANDR
 
 # includes and libs
 INCS = -I. -I/usr/include -I${X11INC}
diff -r 79bf47074a49 dwm.c
--- a/dwm.c	Sat Dec 06 16:20:14 2008 +0000
+++ b/dwm.c	Thu Dec 11 22:50:24 2008 -0500
@@ -42,6 +42,9 @@
 #ifdef XINERAMA
 #include <X11/extensions/Xinerama.h>
 #endif
+#ifdef XRANDR
+#include <X11/extensions/Xrandr.h>
+#endif
 
 /* macros */
 #define BUTTONMASK              (ButtonPressMask|ButtonReleaseMask)
@@ -52,6 +55,7 @@
 #define MAX(a, b)               ((a) > (b) ? (a) : (b))
 #define MIN(a, b)               ((a) < (b) ? (a) : (b))
 #define MAXTAGLEN               16
+#define MAXMONITORS             8
 #define MOUSEMASK               (BUTTONMASK|PointerMotionMask)
 #define WIDTH(x)                ((x)->w + 2 * (x)->bw)
 #define HEIGHT(x)               ((x)->h + 2 * (x)->bw)
@@ -206,10 +210,11 @@
 
 /* variables */
 static char stext[256];
-static int screen;
+static int screen, mons;
 static int sx, sy, sw, sh; /* X display screen geometry x, y, width, height */ 
 static int by, bh, blw;    /* bar geometry y, height and layout symbol width */
 static int wx, wy, ww, wh; /* window area geometry x, y, width, height, bar excluded */
+static int mx[MAXMONITORS], my[MAXMONITORS], mw[MAXMONITORS], mh[MAXMONITORS]; /* monitor area geometry x, y, width, height, bar excluded */
 static unsigned int seltags = 0, sellt = 0;
 static int (*xerrorxlib)(Display *, XErrorEvent *);
 static unsigned int numlockmask = 0;
@@ -926,10 +931,14 @@
 
 void
 monocle(void) {
-	Client *c;
+	int m, i;
+	Client *c = nexttiled(clients);
 
-	for(c = nexttiled(clients); c; c = nexttiled(c->next))
-		resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, resizehints);
+	for(m=0; m<mons; m++) {
+		wx=mx[m]; wy=my[m]; ww=mw[m]; wh=mh[m];
+		for(i=((m==(mons-1))?-1:1); c && i!=0; c = nexttiled(c->next), i--)
+			resize(c, wx, wy, ww - 2 * c->bw, wh - 2 * c->bw, resizehints);
+	}
 }
 
 void
@@ -1427,35 +1436,39 @@
 
 void
 tile(void) {
-	int x, y, h, w, mw;
-	unsigned int i, n;
+	int x, y, h, w, maw;
+	unsigned int i, n, r, g, m;
 	Client *c;
 
 	for(n = 0, c = nexttiled(clients); c; c = nexttiled(c->next), n++);
 	if(n == 0)
 		return;
 
-	/* master */
 	c = nexttiled(clients);
-	mw = mfact * ww;
-	resize(c, wx, wy, (n == 1 ? ww : mw) - 2 * c->bw, wh - 2 * c->bw, resizehints);
+	for(m=0, g=(n+(mons/2))/mons, r=n-g, n=g; c && m<mons; m++, n=(r<g?r:g), r-=n) {
+		wx=mx[m]; wy=my[m]; ww=mw[m]; wh=mh[m];
+		/* master */
+		maw = mfact * ww;
+		resize(c, wx, wy, (n == 1 ? ww : maw) - 2 * c->bw, wh - 2 * c->bw, resizehints);
+		c = nexttiled(c->next);
 
-	if(--n == 0)
-		return;
+		if( --n == 0 )
+			continue;
 
-	/* tile stack */
-	x = (wx + mw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + mw;
-	y = wy;
-	w = (wx + mw > c->x + c->w) ? wx + ww - x : ww - mw;
-	h = wh / n;
-	if(h < bh)
-		h = wh;
+		/* tile stack */
+		x = (wx + maw > c->x + c->w) ? c->x + c->w + 2 * c->bw : wx + maw;
+		y = wy;
+		w = (wx + maw > c->x + c->w) ? wx + ww - x : ww - maw;
+		h = wh / n;
+		if(h < bh)
+			h = wh;
 
-	for(i = 0, c = nexttiled(c->next); c; c = nexttiled(c->next), i++) {
-		resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == n)
-		       ? wy + wh - y - 2 * c->bw : h - 2 * c->bw), resizehints);
-		if(h != wh)
-			y = c->y + HEIGHT(c);
+		for(i = 0; c && (m==(mons-1)?1:n); c = nexttiled(c->next), i++, n--) {
+			resize(c, x, y, w - 2 * c->bw, /* remainder */ ((i + 1 == g)
+						? wy + wh - y - 2 * c->bw : h - 2 * c->bw), resizehints);
+			if(h != wh)
+				y = c->y + HEIGHT(c);
+		}
 	}
 }
 
@@ -1565,11 +1578,45 @@
 	}
 	else
 #endif
+#ifdef XRANDR
+	if( True /* xrr is active? */ ) {
+		int i=0, j=0, k=0, o=0;
+		XRRScreenResources *screenInfo = XRRGetScreenResources( dpy, root );
+		XRRCrtcInfo *crtcInfo = NULL;
+		XID seenOutputs[MAXMONITORS*16]; // 16 clones should be enough
+		for(i=0, mons=0; i<screenInfo->ncrtc; i++) {
+			crtcInfo = XRRGetCrtcInfo( dpy, screenInfo, screenInfo->crtcs[i] );
+
+			if( crtcInfo->noutput!=0 ) {
+				Bool dupe=False;
+				for(j=0; j<crtcInfo->noutput; j++) {
+					for(k=0; seenOutputs[k]!=crtcInfo->outputs[j] && k<o; k++);
+					if( k!=o )
+						dupe=True;
+					else
+						seenOutputs[o++]=crtcInfo->outputs[j];
+				}
+
+				if( !dupe ) {
+					my[mons]=crtcInfo->y + (mons==0 && showbar && topbar ? bh : 0);
+					mh[mons]=crtcInfo->height - (mons==0 && showbar?bh:0);
+					mw[mons]=crtcInfo->width;
+					mx[mons++]=crtcInfo->x;
+				}
+			}
+		}
+		XRRFreeCrtcInfo(crtcInfo);
+		XRRFreeScreenResources(screenInfo);
+
+		wx = mx[0]; wy = my[0];	ww = mw[0]; wh = mh[0];
+	} else
+#endif
 	{
-		wx = sx;
-		wy = showbar && topbar ? sy + bh : sy;
-		ww = sw;
-		wh = showbar ? sh - bh : sh;
+		mons=1;
+		mx[0] = wx = sx;
+		my[0] = wy = showbar && topbar ? sy + bh : sy;
+		mw[0] = ww = sw;
+		mh[0] = wh = showbar ? sh - bh : sh;
 	}
 
 	/* bar position */