iEnable()

         Allows the maskable interrupts

    Syntax:

         iEnable() -> Nil

    Description:

         Allows the maskable interrupts. It does not have effect if the
         maskable interrupts are not in effect.

         Must be called after a iDisable() when you want to allow the
         Clipper VMM system to continue.

    Return:

         Nothing.

    Example:

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