o  The listing level count allows macros to be listed
       selectively; a macro definition can specify .NOSHOW at the
       beginning to decrement the listing count and can specify .SHOW
       at the end to restore the listing count to its original value.

    o  The alternate forms of .SHOW and .NOSHOW are .LIST and .NLIST.

    o  The initial setting for each .LIST/.SHOW option (except
       BINARY) is obtained from the command-line setting using the
       /SHOW qualifier.

    o  The /[NO]SHOW=BINARY option overrides the .[NO]SHOW BINARY
       directive.