Compaq TP Desktop Connector AA–PVNFG–TE Client Services Reference Manual page 128

SELECT
identifier(s) have been selected with the SET command. Specifying /USER
with the SELECT command overrides any default user identifiers that may
have been set. Specifying /USER=* with the SELECT command specifies that
records for all user sessions are selected, overriding any defaults that may
have been set.
6–12 Data Compression Monitor Commands