Al,

Thanks for the reply. Actually there is not problem with the set exclusive off
the program is perfectly run on a multiEvironment. The program is being used already in some of the asian countries, oil company, but lately i found out this bugs i am using also data Environment and these happens only for those major modules who uses the same file but i already declared datasession of form as private, i tried also to run it in different directory one is in c:\drive (in Executable)and the other one is in d:\drive using the source codes. But this happens also , is this pertaining to memory ? but this happens also in all the pc's.

Regards
Reymund