diff -urN --exclude=.cvsingore --exclude=CVS xc/lib/X11/MapRaised.c XFree864_0_2/lib/X11/MapRaised.c
--- xc/lib/X11/MapRaised.c	Sun May  9 18:49:48 1999
+++ XFree864_0_2/lib/X11/MapRaised.c	Tue Apr 24 04:36:20 2001
@@ -33,6 +33,8 @@
     register xResourceReq *req2;
     unsigned long val = Above;		/* needed for macro */
 
+    _YAssignProcessId(dpy, w);
+
     LockDisplay(dpy);
     GetReqExtra(ConfigureWindow, 4, req);
     req->window = w;
diff -urN --exclude=.cvsingore --exclude=CVS xc/lib/X11/MapWindow.c XFree864_0_2/lib/X11/MapWindow.c
--- xc/lib/X11/MapWindow.c	Sun May  9 18:49:49 1999
+++ XFree864_0_2/lib/X11/MapWindow.c	Tue Apr 24 04:36:20 2001
@@ -30,6 +30,9 @@
 	register Display *dpy;
 {
 	register xResourceReq *req;
+
+	_YAssignProcessId(dpy, w);
+
 	LockDisplay (dpy);
         GetResReq(MapWindow, w, req);
 	UnlockDisplay (dpy);
diff -urN --exclude=.cvsingore --exclude=CVS xc/lib/X11/XlibInt.c XFree864_0_2/lib/X11/XlibInt.c
--- xc/lib/X11/XlibInt.c	Tue Dec  5 08:49:43 2000
+++ XFree864_0_2/lib/X11/XlibInt.c	Tue Apr 24 04:36:20 2001
@@ -34,6 +34,7 @@
 #include "Xlibint.h"
 #include <X11/Xpoll.h>
 #include <X11/Xtrans.h>
+#include <X11/Xatom.h>
 #include "xcmiscstr.h"
 #include <stdio.h>
 
@@ -3404,3 +3405,27 @@
 
 #endif
 
+/*
+ * 2001/04/23 mathias.hasselmann@gmx.de:
+ *
+ * YAssignProcessId:
+ *
+ *	Assign a window property with the client's process id.
+ *	Added to allow resource management of the Freebird PDA without
+ *	requiring preload libraries.
+ *
+ */
+
+int _YAssignProcessId(dpy, win)
+    Display *dpy;
+    Window win;
+{
+    static Atom XA_ICEWM_PID = None;
+    pid_t pid = getpid();
+
+    if (XA_ICEWM_PID == None)
+	XA_ICEWM_PID = XInternAtom(dpy, "_ICEWM_PID", False);
+
+    return XChangeProperty(dpy, win, XA_ICEWM_PID, XA_CARDINAL, 32,
+			   PropModeReplace, (unsigned char*) &pid, 1);
+}
diff -urN --exclude=.cvsingore --exclude=CVS xc/lib/X11/Xlibint.h XFree864_0_2/lib/X11/Xlibint.h
--- xc/lib/X11/Xlibint.h	Wed Feb  9 01:18:43 2000
+++ XFree864_0_2/lib/X11/Xlibint.h	Tue Apr 24 04:36:21 2001
@@ -1430,6 +1430,13 @@
 #define _XFopenFile(path,mode) fopen(path,mode)
 #endif
 
+extern int _YAssignProcessId(
+#if NeedFunctionPrototypes
+    Display*		/* dpy */,
+    Window		/* win */
+#endif
+);
+
 _XFUNCPROTOEND
 
 #endif /* _XLIBINT_H_ */