The RLM control block is mapped by the CTTRLM dsect. Whereas an RLM control block is normally created for each Control‑M/Tape rule in memory, the RLM control block created by the rule search API contains information about all DO statements that are triggered by selection criteria specified in the RSO block. For more information, see Input. 

This control block is composed of the following components:

• a rule header

  This part of the control block normally contains rule‑specific information (for example, rule mode).

• information about DO statements that can be assigned only one set of values (for example, DO STACK, DO POOL and DO LABEL)
• information about DO statements that can be assigned multiple sets of values (for example, DO VAULT or DO STKGROUP)
• information about DO statements that perform IOA functions (for example, DO FORCEJOB, DO SHOUT or DO CONDITION)

  Each DO statement describing an IOA function is preceded by a one-byte number describing the length of the DO statement. This number can be used while extracting information from the RLM control block to move from the description of one DO statement to the description of the next DO statement.

For more information about the fields in the RLM control block, see the CTTRLM dsect in the Control‑M/Tape MACRO library.