how to check program already running?

[MaxV]

Hello,
I created an access control time and attendance for my company using livecode.
It automatically starts when the user login successfully.
I want to add to the program a check that verify if it is already launched. So he use can't run more than an instance of the program.
just to give yo the whole picture:

• windows server
• user login in and so he automatically starts my "check Presence" program. The program will run until the user is working.
• at startup it should check program should check if it's already started, in this case "quit". How to do it?

I would not rely on external files (for example at startup write a file "running"), because in case of failures the file would remain there and the program will never start again.

Do you have any suggestion?

[bogs]

Heya Max, long time no see

I created an access control time and attendance for my company using livecode.

If your starting the program using a livecode program, perhaps "open process" and "openProcesses" is what your looking for?

[SparkOut]

Actually you should handle (or not, if desired) the "relaunch" message to control what happens when someone instigates another opening of the same stack.

[stam]

Actually you should handle (or not, if desired) the "relaunch" message to control what happens when someone instigates another opening of the same stack.

+1 !