VMS Help MACRO, /MIGRATION, Qualifiers, /SHOW  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /SHOW[=(function[,...])]
       /NOSHOW[=(function[,...])]

    Provides initial settings for the functions controlled by the
    compiler directives .SHOW and .NOSHOW.

    You can specify one or more of the following functions:

    CONDITIONALS  Lists unsatisfied conditional code associated with
                  .IF and .ENDC MACRO directives.
    CALLS         Lists macro calls and repeat range expansions.
    DEFINITIONS   Lists macro definitions.
    EXPANSIONS    Lists macro expansions.
    BINARY        Lists binary code generated by the expansion of
                  macro calls.