From: Mark Hahn <redacted>
Date: Thu, 14 Jul 2005 21:09:57 -0400 (EDT)

we'd like to tune for some 10Gb, 3-6 ms links, mainly to move large files
between our sites.  this is not CERN-scale stuff, but being able to configure
large windows on particular routes sounds terribly convenient...

You can set the window, but you must lock the setting.