I modifeid this for somebody. I don't remember who.

ScreenThief - stealing screen shots over the Network

http://delphi.about.com/library/weekly/aa012004a.htm

A free network screen shot grabber application, with source code.
Learn how to send / receive raw (binary) data (screen shot images) using TCP connections.

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Zarko Gajic, BSCS
About Guide to Delphi Programming

Source Code