B yRef and ByVal are two ways to pass arguments to a function or subroutine in VBScript. Understanding the difference between two is simple. Let us start with ByVal. Suppose a function or subroutine has an argument which accepts a variable with byval, suppose a variable x is passed as argument to the function, The value of variable does not change once the function is executed successfully. Now let us move to ByRef. ByRef means passing value as a reference. Suppose a function or subroutine has an argument which accepts a variable with byref, suppose variable x is passed as argument to the function, The value of variable changes once the function is executed successfully. Writing the below function in a notepad and running as a vbscript will help to differentiate ByVal and ByRef By Ref Code: Dim x x= 5 call squareofNumber(x) msgbox x Function squareofNumber(ByRef varx) varx = varx*varx ...