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Boolean operation

Or produces a value of true if some value is true and false if both of its operands are false.

Truth table

A B   A or B  
  false     false     false
  false   true   true
  true   false   true
  true   true   true

Bitwise operation

Bitwise or sets the bit to 1 if one corresponding bits in its operands are 1, and to 0 if they all are 0.

Set a bit

function SetBit(const AValue, ABitNumber:integer):integer;
   result := AValue or (1 shl ABitNumber);

If you call SetBit(%1000,1) then get %1010 (%1000 = 8 and %1010 = 10). If you call SetBit(10,2) then get 14 (14 = %1110). If you call SetBit(10,1) then get 10.

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