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VERW              Verify Write (286/386)             Flags: O D I T S Z A P C
                                                                      *
VERW Source

           Logic:        if source can be written to then ZF . 1
                         else ZF . 0

     This instruction sets the zero flag if the current procedure can use
     source as a selector to write to. If the zero flag is not set,
     writing to source will cause a memory fault.

  --------------------------------------------------------------------------
   Operands                   Clocks   Transfers  Bytes  Example
   VERW register              14 (286)     -        3    VERW DX
   VERW memory                16 (286)     -        5    VERW TASK
  --------------------------------------------------------------------------

        Note:          This instruction is only available in privileged
                       mode.