Having two versions of NAV on single computer

Two Versions of Navision On Same Computer
http://msnavarena.blogspot.com/2007/05/two-versions-of-navision-on-same.html

CONFIRMED! NAV SP0 and SP3 cannot co-exist using setup/installation procedure

Note to self:
Copying CLIENT folder seems to have side-effect:
- Windows authentication won't work
- License file need to be RE-selected to remove "license expired" message
Plus, database users must be given db_owner database role, otherwise they will get strange error such no permission to read G/L Setup table, etc