HP 3000 Manuals

Micro Focus COBOL Language Reference

For MF only:  Conditional Compilation 

The COBOL system provides a mechanism for selectively compiling part or
all of the COBOL source.  To benefit fully from the advantages of
conditional compilationthe use of level 78's (see the chapter Program 
Definition) and the CONSTANTsystem directive is recommended.  Conditional
compilation is controlled by $IF, $ELSE, $END constructs.  It behaves in
a similar way to the COBOL IF construct.

MPE/iX 5.0 Documentation