And

Takes the two top values on the boolean stack and and's them together. If both are true it results in true being placed on the conditions stack. If both false or one is false it will place a false on the conditions stack.

false false 0 and puts false on the boolean stack
false true and puts false on the boolean stack
true false and puts false on the boolean stack
true true and puts true on the boolean stack

Logic: true false and or not xor