Anil Roychoudhry has just written a great writeup on how the Seamless feature began.
Anil was one of the original Datapac developers and is now a manager within the Sydney site for Citrix.
http://citrite.org/blogs/anilr/2006/10/20/history-of-seamless/
I highly recommend this article to find out how Seamless was created.
Live near Brisbane, Australia. Software developer currently focused on iOS and Android. Avid Google Local Guide
Red Circle Blog 
Hmmm. the link doesn’t appear to exist.
The domain citrite.org went away quite a few years ago. Unfortunately this information is most likely lost now.