Instream Procedures & Catalogue Procedures

In stream procedures :-

These are predefined jcl statements within job

This must be coded immediate after the job with proc openrand must be terminated with pend

Max 15 procedures can be defined within the job. And these procedures will be available only for the job when procedures are defined

Parameters can be overridden by stepname .ddname  as dd name

Ex:- sort logic data from one ps to another

Catolg procedures:-

These are the predefined jcl statements outside of the job

This procedures must be coded in members which must be sorted in pds

Can be executed by any job but location of the procedure must specified with poclib ddname immediately after the job

Max 255 procedures can be defined in one job

Symbolic parameters (&) must be used to override the parameres that should be coded prefix with &

Refer back :-

It is used to use the same activity level parameter at one level at another level

This can be used to refer the dataset which are created in the previous steps from subsequent steps

It must be coded with *.stepname.ddname