Customizing for profile sharing

Some TSO users require the use of multiple ISPF sessions. For example, a user might need to:

Log on simultaneously through a z/OSMF ISPF session and a telnet 3270 session, or
Log on through multiple z/OSMF ISPF sessions (this is different than having split screens, which is also allowed).

To have multiple ISPF sessions, the user's logon procedure must be configured to allow profile sharing. With profile sharing enabled, the user's logon procedure is required to allocate ISPF profile data sets with the disposition SHARED, rather than NEW, OLD, or MOD, and the data sets must already exist. Or, these data sets must be temporary data sets. For more information, see the topic on profile sharing in .