Ever wanted to set a hard coded break-point in a program and not disturb any other users? You could write an if statement checking SY-UNAME, however there is a macro that does exactly that for you. Just type use BREAK
in your code, where is your UserID.
For example : BREAK JOHN. This will do exactly the same as IF SY-UNAME = 'JOHN'. BREAK-POINT. ENDIF.