Called by the server procedure to have the Portmapper delete a
    mapping of the procedure's program and version number.
    Format
      #include  <rpc/pmap_clnt.h>
      bool_t  pmap_unset(u_long prognum, u_long versnum);

1 - Arguments

 prognum
    The program number associated with the server procedure.
 versnum
    The version number associated with the server procedure.

2 - Description

    A server interface to the Portmapper, which destroys all mapping
    between the triple [prognum, versnum, *] and ports on the local
    host's Portmapper.

3 - Return Values

    TRUE               Indicates success.
    FALSE              Indicates failure.