controlkeystate TacControlKeyState component
Hierarchy Properties Events
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Overview
The acControlKeyState can determinate states of -Caps, -Num, -Scroll, -Control, -Shift keys and change their conditions by blinking the LEDs on the keypad.  
 
acControlKeyState will also watch for changes of the keyboard states and fire some events, indicating that state of some control keys has changes.  

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keystate
 NumLock := True;
 CapsLock := False;
 ScrollLock := True;