It's not IE6, but subprofile.com was locked into one specific version of Apache 1.x. The service allowed you to create an extended "AIM profile" (a 'subprofile'

It's not IE6, but subprofile.com was locked into one specific version of Apache 1.x. The service allowed you to create an extended "AIM profile" (a 'subprofile'), and your friends could click through to see everything in the same window. Lots of people (myself included) created subprofile-like services, but the subprofile folks found the one version of Apache that caused headers to be sent in such a way that you stayed in the AIM profile window when clicking on their links. In contrast, for any of the other services, a click would take you to a normal browser (much lamer, of course).