rem: if (!XChangeProperty(dpy, requestor, property, type, format, PropModeReplace, value, length)) return False;
context: writeSelection(Display *dpy, Window requestor, Atom property, Atom type,	       void *value, long length, int format){/*    printf("write to %x: %s\n", requestor, XGetAtomName(dpy, property));*/    gotError = False;    if (!XChangeProperty(dpy, requestor, property, type, format, 			 PropModeReplace, value, length))	return False;    XFlush(dpy);    return !gotError;}