$User

The $USER function returns a 5-character string equal to the user's user number. In an n-terminal system, User 0 is user number 00000 and the terminal users are numbered 00001 through n. The value of $USER is always unique to a user during a terminal session. The value of $USER remains the same from one session to another only in installations with static SNA Communications Server or CMS threads. This function takes no arguments.