/*  $DOC$
 *  $FUNCNAME$
 *      INVERTWIN()
 *  $CATEGORY$
 *      HBCT video functions
 *  $ONELINER$
 *
 *  $SYNTAX$
 *
 *  $ARGUMENTS$
 *  $RETURNS$
 *  $DESCRIPTION$
 *      TODO: add documentation
 *  $EXAMPLES$
 *  $TESTS$
 *  $STATUS$
 *      Started
 *  $COMPLIANCE$
 *      INVERTWIN() is compatible with CT3's INVERTWIN().
 *  $PLATFORMS$
 *      All
 *  $FILES$
 *      Source is invrtwin.prg, library is libct.
 *  $SEEALSO$
 *  $END$
 */
