You can disable (grey) the cancel by editing a file with a resource explorer. This has been discussed on the board. As Jack mentioned, you can invoke the must logon policy also.

No matter how much effort you put into it, it's still Wintendo. You cannot make a silk purse out of it.

Also, check out www.fortres.com
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Give a man a fish and he will be back for more. Slap him with a fish and he will go away forever.