Just a question - I found a program called HTTP-Tunnel on prompting from a user to find this program in an earlier thread. It appears to use port 80 to send out requests to HTTP-Tunnel servers, which then process the taks and return the information. Since firewalls provide access to remote hosts on port 80 for HTTP, this program enables people to use programs like ICQ and telnet when they are not supposed to.

If there is no way to prevent this sort of unauthorised access, then I was justly negged for finding the program and linking to it; but now I have a question: Is there any way to prevent this sort of program from being implemented by a user to circumvent a firewall?