The best/most concise description of RWIN I've read.
Quote:
RWIN (TCP Receive Window) is a buffer that determines how much data the receiving computer is prepared to get at one time.
A RWIN value that's too large will result in greater loss of data if a packet is lost or damaged. A too small RWIN will be very slow, as each packet will have to be acknowledged before the next packet is sent.
RWIN is one of the most important parameters in tweaking any TCP/IP connection.
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Basically, the main thing this app does is let you change the size of the window. You really shouldn't mess with the value unless you know what you are doing, and if it's set at over 250000 - you probably don't need to either.