For the entry codes described in Table 1 and Table 2, the directory services management exit routine can use the 8-byte user data field, initialized to 0, for any purpose. For example, the exit could use this field to store the address of a storage area obtained dynamically. VTAM® saves the contents of this user field after every successful invocation of the directory services management exit routine. Thus, the contents are available to the exit routine the next time the routine is called. This field is cleared to 0 when the directory services management exit becomes inactive.

The last 4 bytes can be used to uniquely identify the level or version of an exit. The last 4 bytes are displayed following subsequent use of the DISPLAY EXIT command. See z/OS Communications Server: SNA Operation for information about this command.