Need help on proxies

Hi Guys,

I am new to XI. Certified but never got a chance to work practically. Now i would like to get into an XI project.

I have done file-file, IDOC-File scenaros.

I would like to know abt proxies.

Please help me giving:

what is Proxy and why it is used?

and some simple documents on proxies.

Cheers,

Karthick