Invert bit.
Source position: syshelph.inc line 943
public function TShortIntHelper.ToggleBit(  | 
const Index: TShortIntBitIndex  | 
):ShortInt;  | 
ToggleBit reads bit value from bit number determined by argument Index, inverts it (if it was 0 it becomes 1, and vice versa), and stores it back.
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Set bit to 1.  | 
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Set bit to 0.  | 
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Check bit.  | 
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Return the position of the leftmost bit set.  | 
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Return the position of the rightmost bit set.  | 
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Count number of bits set.  | 
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Read or write a bit.  |