Assembly Language Help (alang.hlp) (Table of Contents; Topic list)
LOCK Instruction
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  Title:    Lock the Bus                          Flags: O D I T S Z A P C
                                                         ═════════════════
  Syntax:   LOCK instruction                                  -none-
 
  Description:
 
     Locks out other processors during execution of the next
     instruction. This instruction is a prefix. It must precede an
     instruction that accesses a memory location that another processor
     can attempt to access at the same time.
 
     See Intel documentation for details on multiprocessor
     environments.
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