Some functions require you to put a parameter or variable into their parentheses. When you insert a parameter or variable into a function’s parentheses, it’s called “passing” that parameter or variable to the function. For example:

Box1.Append(IntVar)

In this expression, the value of the variable IntVar is passed to the function Append. The Append function, in turn, operates on that parameter by placing it in the Text Box object named “Box1″.