Some TSO/E and ISPF functions are restricted or unavailable under z/OSMF ISPF. Users should be aware of the following usage considerations:

• z/OS® creates an address space for each ISPF task session that is started. An individual z/OSMF user can have up to ten active ISPF task sessions. To conserve system resources, z/OSMF allows no more than 50 ISPF task sessions to be started on your system at any one time.
• In some situations, logon pre-prompt exits IKJEFLD and IKJEFLD1 that set the Don't Prompt control switch bit on can prevent z/OSMF ISPF users from logging on, or might not work with z/OSMF ISPF.
• An ISPF task user cannot:
  • Switch to TSO/E native mode from within a z/OSMF ISPF session.
  • Log in remotely to TSO/E on another z/OS system from z/OSMF ISPF.
  • Use full-screen applications that run outside of ISPF, such as OMVS, TELNET, or GDDM®.
  • Receive TSO/E messages, such as message from MVS™ operators or users in TSO/E native mode.
  • Use commands that are not allowed in traditional ISPF, such as TSOLIB and LOGON.
• Most VTAM® terminal macros used by full screen applications, such as GTTERM or STFSMODE, are not supported under z/OSMF ISPF. However, you can use the GTSIZE macro or GETDEVSZ macro to obtain the screen size.
• Broadcast messages are not displayed at log on.
• Session Manager is not available; do not specify ADFMDF03 in your logon procedure. Your logon procedure should use the IBM-supplied terminal monitor program, IKJEFT01, which is specified on the PGM= operand of the EXEC statement.
• The REXX and CLIST system terminal ID (SYSTERMID) variable is blank for z/OSMF ISPF task sessions.