How can you tell that you are at CA DADS Plus 4.0 SP2?
Z/OS
CICS
This is equivalent to a "genlevel", and in this case it was genlevel 0507. If you go into a region and enter "DADC" you should see this on line 23 at the bottom of the screen:
GENLEVEL = 0507.-------------------------------------------------------------
This means the genlevel was created July, 2005.