# Prerequisites

- Determine which HUB you should use.
- Ensure the HUB has IBM z/OS Logger streams defined and they are operational.

CICS

1. The call to "TIB_WRITE_SYSLOG" cannot be Functioned Shipped (via MRO) - each call is executed in the CICS Address Space issuing the "TIB_WRITE_SYSLOG" call.
2. The call to "TIB_WRITE_SYSLOG" is synchronous, but due to the minimal overhead can also be issued from programs running on the QR TCB.
3. The field HUB in the TIB_Write_SysLog control block is ignored when specified.
   1. If the CICS region Mainframe RED is enabled, the HUB name set for that region is used.

Batch

1. The call to "TIB_WRITE_SYSLOG" is synchronous.
2. The field HUB in the TIB_Write_SysLog control block will be used if present.
   1. If HUB is all blanks or nulls, the Batch default is used.
3. After the first call to "TIB_WRITE_SYSLOG", the HUB being used is locked (you cannot change the HUB name between calls).

Refer to the section Mainframe Logger - Samples of this user's guide.

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