Check bit.
Source position: syshelph.inc line 1000
| public function TWordHelper.TestBit( | 
| const Index: TWordBitIndex | 
| ):Boolean; | 
TestBit reads boolean value (true if bit is 1, and false if bit is 0) from bit number determined by argument Index.
| 
 | Set bit to 1. | |
| 
 | Invert bit. | |
| 
 | Check bit. | |
| 
 | Return the position of the leftmost bit set. | |
| 
 | Return the position of the rightmost bit set. | |
| 
 | Count number of bits set. | |
| 
 | Read or write a bit. |