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The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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     The possible values of level are:
 
      3    Compatible with X/Open Portability Guide 1988 (XPG-3)
      4    Compatible with X/Open CAE Specification (XPG-4)
 
     Specifying XOPEN with no parameter is the same as specifying
     XOPEN "4". Note that XPG-4 specifies options for several environments.
     If available, the options available are as follows:
 
      o  Single Byte Internationalization Support is enabled using the
         NLS directive
      o  National Character Support is enabled using the DBCS "3"
         directive
 
     See also ◄DBCS directive►
              ◄NLS directive►
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