InfoConnect VBA Guide
Attachmate.Reflection.Objects.Emulation.OpenSystems Library / Screen Object / LockInput Method
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    LockInput Method (Screen)
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    Locks the screen and prevents input from the keyboard.
    Syntax
    expression.LockInput() 
    where expression is a variable that represents a Screen Object
    Remarks
    Other means of input (such as macros or the application programming interface) are still available. To release the lock, use UnlockInput().
    See Also