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NAME
    UnLoadSeg -- Unload a seglist previously loaded by LoadSeg()

SYNOPSIS
    success = UnLoadSeg( seglist )
    D0                     D1

    BOOL UnLoadSeg(BPTR)

FUNCTION
    Unload a seglist loaded by LoadSeg().  'seglist' may be zero.
    Overlaid segments will have all needed cleanup done, including
    closing files.

INPUTS
    seglist - BCPL pointer to a segment identifier

RESULTS
    success - returns 0 if a NULL seglist was passed or if it failed
              to close an overlay file.  NOTE: this function returned
              a random value before V36!

SEE ALSO
    LoadSeg(), InternalLoadSeg(), InternalUnLoadSeg()