How to Lock or Unlock a client in sap (Upgrade support package,client copy)

** Credit  http://sap-basis-security.blogspot.com/2007/12/how-to-reset-different-buffers-in-sap.html

## Only super user can login into the client.
To lock or unlock a client in R/3 System, run the following function modules in transaction se37
1. SCCR_LOCK_CLIENT ( to lock the client)
2. SCCR_UNLOCK_CLIENT (to unlock the client)
Run these functions with a client input which is to be locked/unlocked. This function set flag '' Client is locked temporarily for client copy" in client maintenance menu.The client will be available for users DDIC and SAP*. If any other user tries to login, system gives message that ' Client locked temporarily'.
To unlock the client
1. Run transaction SE37
2. Enter the function module as SCCR_UNLOCK_CLIENT
3. press F8 or test run (single run).
4. Specify the client and execute(F8).
Follow similar procedure for locking the client