Dr. TCP will do exactly what you want:
http://www.dslreports.com/tools
There are also articles on calculating your RWIN value.

You might also want to consider TCP Optimizer:
http://www.speedguide.net/downloads.php

You might also be interested in a patch to TCPIP.SYS to unlimit your
concurrent TCP connections to more than 10:
http://www.lvllord.de/?lang=en&url=4...c8d16f7e4c9511

Enjoy.

BTW, your cross-posting is generally pretty much frowned upon.
--
Hoppy
General.Disarray@Unrealized.Reality.com
~~

nntp.post@gmail.com wrote on 5 Jan 2006 08:58:22 -0800:

np> Using a win xp pro laptop. I use it to connect to serveral different
np> networks:
np> ·1.5mbs T1 at work via wifi and wired
np> ·8.0/768 cable modem connection at home via wifi and wired
np> ·Verizon EVDO 1xRTT on the road
np> ·WiFi at places like Starbucks and Airports (guessing about a T1
np> connection to Internet)
np> ·Dialup on the road sometimes

np> Ultimately, I'd love a tool that lets me save different profiles and
np> switch RWIN depending on the connection type.

np> I've done tests on DSLReports (www.dslreports.com/tweaks) and see that
np> depending on location and connection type I should use different rwin
np> settings for best performance. I can set these using drtcp, but does
np> anyone know of a better tool that doesn't require a reboot and will
np> allow for profile switching depending on where and how I am connected?