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 twDelGlobal( nHndl )
 ----------------------------------------------------------------------------
     Remove a global variable from the internal stack.

       Arguments:

     nHndl - 'N' Handle of the variable to delete.

       Return:

     Length of the global stack.

       Example:

     twDelGlobal( NORMALCOLOR ), where NORMALCOLOR is a manifest
     constant.

See Also: twInitGlobal() twGetGlobal() twSetGlobal() twAddGlobal()

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