iDisable()

         Inhibits the maskable interrupts

    Syntax:

         iDisable() -> Nil

    Description:

         Inhibits the maskable interrupts and causes the Clipper VMM
         system to not use the "dead times" to continue it's work.

         This very useful when the response time of a process is crucial
         and we do not want the VMM to use the false dead times.

         Remember that any interrupt can not be used if you do not call the
         function iEnable().

    Return:

         Nothing.

    Example:

         iDisable()
         For nInd := 1 To 100
           NullFunc()               // in this process the VMM is stoped
         Next
         iEnable()