The /F SARXMS,LIST STATUS,ALL command (Where SARXMS is the name of the XMS region) can be issued to get a current status of the running XMS region.
The meaning of each of the items returned when the command is issued are as follows:
USERNAME is set to *XMS* for this message. MAX is the maximum number of XMS users allowed in all the of XMS regions (from EBCXMCTR). CUR is the current number of XMS users that are are logged onto all of the XMS regions. HI is the high water mark of XMS users logged onto all of the XMS regions. STATUS is the status of the XMS environment. FLAG is a hex display of the flag bytes for the XMS environment. LONGWT is a hex display of additional flags for the XMS environment. VERSION is the name of the XMS control block used for XMS logons.