Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
CLTS Instruction
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  Title:    Clear Task-Switched Flag              Flags: O D I T S Z A P C
            80286-80486 Privileged Only                  ═════════════════
                                                              -none-
  Syntax:   CLTS
 
  See also: .286P
 
  Description:
 
     Clears the task-switched flag in the Machine Status Word (MSW) of
     the 80286 or the CR0 register of the 80386/486.
 
     Use this instruction only in systems software executing at
     privilege level 0. See Intel documentation for details on the task-
     switched flag and other privileged-mode concepts.
                                    -♦-