BRANCH: Specify the Entry to the Macro

BRANCH=NO: Requests the SVC (default) entry. Protect key checking is performed.
BRANCH=YES: Equivalent to BRANCH=(YES,SUP), because SUP is the default when you code YES. You must be in supervisor state. Protect key checking is bypassed.
BRANCH=(YES,SUP): Requests the branch entry. You must be in supervisor state. Protect key checking is bypassed. If you specify BRANCH=YES, supply an 18-word save area. You cannot hold a lock at entry to CVAF. You cannot be in SRB mode.
BRANCH=(YES,PGM): Requests the branch entry. You must be APF authorized and be in problem state. Protect key checking is bypassed.