Specifying DSECT=YES (the default for all macros) creates a DSECT. Addressability requires a USING and a register pointing to storage.

Specifying DSECT=NO (exceptions are listed when this is not allowed) allocates space in the current DSECT or CSECT. In reentrant programs, programmers can place these macros in the DSECT with DSECT=NO, and addressability is accomplished without the individual USING required by DSECT=YES. Nonreentrant programs can place their macros in the program's CSECT, and addressability is obtained through the program base register(s).

Specifying LIST=YES (the default for most macros) causes the expansion of the macro to appear in the listing. You can override this by using PRINT OFF.

Specifying LIST=NO removes the macro expansion from the listing.

Additional keywords VARLEN and PREFIX are described in the individual sections where they apply.