>do not forget that vfp may allocate memory as well while your program is running , eg for variables

Sure.

The tests are not run in situ within a large applcations but as standalone test routines. I'll implement this putfile replacement very carefully when we have confirmation that it is rock-solid.

I just made a last manual test. Running a very plain test - 2 000 calls of the dialogbox - the memory use moves from around 3.5 MB, plain vfp interactive session with zero addition, to nearly 50MB. The only way to clear the memory use "Quit".... Well 2 000 "save as..." action call is not your standard user activity:-)

Nice to get some understanding on the way VFP handles its memory assignements vs OS-supported memory allocation. I understand that there might be some difficulty here.

Daniel