Installation-Defined Section

This section is identified by an identifier field of B‘11xxxxxx’ and a modifier field of the installation's choice. This section is not used by any IBM ¹ products, but will be passed through the network.

Beyond the four-byte definition, this section is the responsibility of the installation. The section length is limited to 32764 bytes. The combined length of all sections in the header is limited to 32764 bytes, although product implementations may be more restrictive. The length must be reflected in the NJHULEN field in the front of the control record section header. The following depicts a sample eight-byte field:

Table 1. Fields in the Job Header Installation Extension Section
Field Name	Offset in Hex	Length	Type of Data	Default Value	Valid Range	Description
NJHULEN	0	2	binary	none	4-32764	Length of the section.
NJHUTYPE	2	1	binary	none	C0-FF	The major type of the installation-defined section.
NJHUMOD	3	1	binary	none	none	Modifier for the major type identifier.
NJHUCODE	4	4	char	none	none	This could be used for a GUIDE/SHARE installation code, or some other unique identifier.