Why only 1 form can be running at the same time?

Hello guys,
I wonder if you can help me..
At the company i work in, some application has a problem where the same applicatoin can not be opened if there are already somebody else opening the same application. what is the cause of this behaviour?
another problem is some computer generate SSL integration error messages when trying to open an application. While at other computer the application run fine. Any idea why this happen?
thanks in advance

At the company i work in, some application has a
problem where the same applicatoin can not be opened
if there are already somebody else opening the same
application. what is the cause of this behaviour?A record is probably locked. This can happen when one user is updating a record and another user tries to update the same record before the first user is done (committed the record).
another problem is some computer generate SSL
integration error messages when trying to open an
application. While at other computer the application
run fine. Any idea why this happen?Hard to say without knowing the error message.

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