remote proxy

I want to test if anyone from my network can use remote proxy.
I found the following defenitions in the Internet : Remote Proxy -  These are simply websites that you go to, then surffrom. They act as the middle-man, hiding you.
Currently we are using our own proxy -TMG, and all my clients PCs are set up to use TMG.
Do anyone know how I can test if they can use any remote proxy and surf in internet and open  sites which are blocked by our URL filtering device(checkpoint R75.20)
dedriAsked:
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btanExec ConsultantCommented:
Looks like the client proxy setting can be changed and it is opening up means to change the setting. http://technet.microsoft.com/en-us/library/cc441482.aspx

One tedious means, can be go into client and use netstat or other connection display utility to verify connections appear for client-proxy but not client-server. if this can be remotely done, it will be better.

Also there are some online revealer that you may be interested in.
http://www.lagado.com/proxy-test
http://decloak.net/
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