This example of a TPXBATCH Job provides you with a list of all users and their STX-sessions:
//BATCH EXEC tpx,VNODE='*BATCH*'
//EXTFIL DD DSN='AAA.BBB.EXTRACT',DISP=SHR
//RPTFIL DD SYSOUT=*
//SYSIN DD *
EXTRACT GIVING(EXTFIL) USER AND ALL SESSIONS (VSES$TPX(Y))
SET RTITLE1 '1USERNAME LAST LOGON'
SET RTITLE2 ' -------- ----------'
REPORT GIVING(RPTFIL) USING (EXTFIL)
(
(' &UIDXNAME' '&VSES$TPX')
)
//