How to Lock a screen

Can any body tell me how to lock a particular screen when it is being accessed by another user... is there any function modules available for that

HI,
  I dont think there is any way to lock a screen. But I would say there is no need to lock a screen. Can you tell mewhy you want to lock a screen. If you are displaying some data in the screen in editable mode then you need to lock the database record corresponding to that data. Thats how you avoid access to data that is being accessed by other users. Can you tell me your requirement.
If you want to lock a table record then you need to create lock object and then use ENQUEUE and DEQUEUE function modles.
Regards,
Sesh

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