I have execute file call ac.exe, I want to make this exe only single user can use . How to make exe to single user environment . In login form ie ok button and cancel button. In ok button, I do set the public
variable multi_user to "N" as belows:-

Multi_user = "N"
then In the Ok Button check :-
If Multi_user ="N"
set exclusive on
else
set exclusive off
endi

I test run, Two persons still can get in
then i try the other ways. I put same code into the Main.prg, Well I works. It come out the message : Access Denied. But the problem the message box have three buttons ie cancel, ignore, help. I try to click ignore... It let me into the program.... Why