Run the following function modules in transaction se37
SCCR_LOCK_CLIENT ( to lock the client)
SCCR_UNLOCK_CLIENT (to unlock the client)
For your requirment you can lock all the users in system using SU01.
Run the following function modules in transaction se37
SCCR_LOCK_CLIENT ( to lock the client)
SCCR_UNLOCK_CLIENT (to unlock the client)
For your requirment you can lock all the users in system using SU01.