An expression that evaluates to one of two states, such as on or off. The off state is always zero and is represented by the intrinsic constant False. The on state has two definitions: one bit-wise, the other logical. The bit-wise definition is represented by the intrinsic constant True and always equals -1. The logical definition is used in testing for conditional expressions in statements such as If condition Then... or While condition...Wend where any expression that evaluates to nonzero (including -1) fulfills the condition.