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<p>Your browser doesn't support frames Please upgrade your browser to take advantage of all features of <a href="http://firewall.com/" target="_top">www.firewall.com</a>. </p> <p>Click on the link to proceed to <a href="http://firewall.com/software/xcrowbar.c" target="_top">xcrowbar.c</a> - Source code demonstrates how to get a pointer to an X Display Screen, allowing access to a display even after "xhost -" has disabled acess. Note that access must be present to read the pointer in the first place! (Originally posted to USENET's comp.unix.security.)