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  Syntax:   OPTION PROC:visibility
 
  See also: PROC
 
  Description:
 
  Sets the default procedure visibilty. The <visibility> parameter can
  be PRIVATE, PUBLIC, or EXPORT. If you do not use this option, the
  the default visibility will be PUBLIC.
 
  With OPTION M510, the default <visibility> with no defined language type
  is PRIVATE. If you specify a language type in a .MODEL or OPTION LANGUAGE
  statement, the default <visibility> is PUBLIC.
 
     Without a language type, MASM 5.1 makes procedures private to the
      module. By default, MASM 6.1 makes procedures public. You can explicitly
     change the default visibility to private with either OPTION M510,
     OPTION PROC:PRIVATE, or OPTION PROC:EXPORT.
 
     To selectively enable MASM 6.1 behavior, place the directive
     OPTION PROC:PUBLIC after OPTION M510. You can override the default
     by adding the PUBLIC or PRIVATE keyword to selected procedures.
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