Consider these points before you configure your system:

• A RACF® OMVS segment (or equivalent) that specifies a valid non-zero uid, home directory, and shell command must be defined for each user of the interface.
• Set MAXPROCUSER in BPXPRMxx parmlib member to a minimum of 50. This can be checked and set dynamically (until the next IPL) with the following commands (as described in z/OS MVS™ System Commands, SA22-7627):

  DISPLAY OMVS,O
  SETOMVS MAXPROCUSER=50.

  Setting a value that is too low can cause the interface to fail.
• Table 1 describes the load modules that comprise the gateway:

  Table 1. Load modules comprising the gateway

  Name	Library	Description
  ISPZINT	ISP.SISPLPA	Gateway initialization - routes processing to ISPZINO or ISPZINL.
  ISPZINO	ISP.SISPLPA	Gateway initialization - manages spawned TSO sessions, routes command requests to these sessions.
  ISPZINL	SYS1.SIEALNKE	Gateway and TSO initialization - uses CEA TSO/E address spaces services to start and stop TSO sessions.
  ISPZTSO	SYS1.LINKLIB	TSO initialization - attaches a TSO session to run a command. ISPZTSO must run APF-authorized.
  ISPZCNT	ISP.SISPLOAD	ISPF initialization - allocates data sets and starts an ISPF session.
  ISPZCMD	ISP.SISPLOAD	ISPF command interface - invokes an ISPF command and, if required, keeps the ISPF session active.
  ISPZTMO	ISP.SISPLOAD	Reusable session time-out processor.

  These load modules must be available to run under the server used to communicate between the client and z/OS® host.

  A PROGRAM class profile that identifies ISPZINT as being a controlled program should be defined using the command:

  RDEFINE PROGRAM ISPZINT  ADDMEM('ISP.SISPLPA'//NOPADCHK) UACC(READ)

  (Refer to your security server's documentation for details.) Failure to define ISPZINT as being controlled might result in messages, such as CSV042I or ICH422I, being issued.
• Table 2 describes the gateway files installed into the z/OS UNIX file system:

  Table 2. Gateway files installed into the z/OS UNIX file system

  Name	Description
  /usr/lpp/ispf/bin/ISPZINL	A stub file with the sticky bit set on to enable invocation of the gateway and TSO initialization load module ISPZINL.
  /usr/lpp/ispf/bin/ISPZINO	A stub file with the sticky bit set on to enable invocation of the gateway initialization load module ISPZINO.
  /usr/lpp/ispf/bin/ISPZINT	A stub file with the sticky bit set on to enable invocation of the gateway initialization load module ISPZINT.
  /usr/lpp/ispf/bin/ISPZTSO	A stub file with the sticky bit set on to enable invocation of the TSO initialization load module ISPZTSO.
  /usr/lpp/ispf/bin/ISPZXENV	A REXX routine called by the gateway XML API routine, ISPZXML, to set up environment variables.
  /usr/lpp/ispf/bin/ISPZXML	A REXX routine that is the XML API for the gateway.