Actually, it is not quites as simple as Scott said.
EGuide 4.2 only works with SAS 9.2 . See
http://support.sas.com/forums/thread.jspa?messageID=11739ⷛ
I have used EGuide 4.1 with SAS 9.1.3 and 9.2 on Windows. 9.2 works fine, but you don't get a lot of 9.2 new features. There are a number of posters who use 4.1 with 9.1.3 on various flavors of Unix.
I recall that 4.1 works with 8.2, but again you loose some functionality (and it may choke on some things like the classes in logistic that don't exist in 8.2).
The user interface on EGuide 4.1 is so much improved over EGuide 3.1 that I would not consider 3.1 unless you have no other choice.
Doc Muhlbaier
Duke