Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
VERR/VERW Instructions
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  Title:    Verify Read or Write                  Flags: O D I T S Z A P C
            80286-80486 Protected Only                   ═════════════════
                                                                   ±
  Syntax:   VERR src
            VERW src
 
  See also: .286
 
  Description:
 
     Verifies that a specified segment selector is valid and can be
     read or written to at the current privilege level.
 
     VERR verifies that the selector is readable; VERW verifies that
     the selector can be written to. If the segment is verified, the
     zero flag is set. Otherwise, the zero flag is cleared.
                                    -♦-