Short Circuit Operators

Operators that perform a short circuit logical evaluation.

The short circuit operators perform a evaluation on the left hand operand, 
and depending on the result, may go on to evaluate the right hand side.  
The evaluations take place logically, in a comparison to zero.

KeyPgOpAndAlsoOperator Andalso (Short Circuit Conjunction)
	Returns the result of a short circuit conjunction of two operands.
KeyPgOpOrElseOperator Orelse (Short Circuit Inclusive Disjunction)
	Returns the result of a short circuit inclusive or of two operands.

