VJD - understanding Scripts

Hey,

Am new to Vijeo designer have understood how to use int, real and string type syntax-es.

However, with boolean I'm stuck.
I can display boolean on a string or numeric display. But how do I make the following scripts work?

1. boolean PopupWindowName.moveOffset(int X, int Y);

2. boolean PopupWindowName.changePanel(int panel_ID);

3. boolean PopupWindowName.show(boolean Status);

Could you show me a sample?

Also why does PopupWindowName.open(int X, int Y);
not work without 2 & 3?

Thank You.