Returns a non-zero number if the specified ByRef parameter was supplied with a variable.
TrueOrFalse := IsByRef(ParameterVar)
A reference to the variable. 예를 들어: IsByRef(MyParameter)
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This function returns 1 if ParameterVar is a ByRef parameter and the caller supplied a variable; or 0 if ParameterVar is any other kind of variable.
Reports 1 (true) because Param is a ByRef parameter and was supplied with a variable.
MsgBox, % Function(MyVar) Function(ByRef Param) { return IsByRef(Param) }