>>-USERID--(-+-ON--+-)----------------------------------------->< '-OFF-'
USERID ON displays your user ID in the panelid area of the screen. USERID OFF removes your user ID from the visible display.
The commands SYSNAME, USERID, PANELID, and SCRNAME share the same 17-character area at the start of the Title line. If more than one of these commands are specified, ISPF displays as many as will fit, in this order of priority: SYSNAME, if specified, is always displayed. Then, as long as there is enough room, USERID is displayed, then PANELID, then SCRNAME.