Ruby: Dialog Boxes on Particular Screens

Currently working with / developing for / supporting 开发者_开发技巧a multi-platform application that uses Ruby in the front-end. The application is regularly used on systems with multiple monitors, as many as five in the usual cases. On Windows machines, when our application opens up a dialog box, it has the habit of opening the dialog box on the "first" screen, even if the application is running on another screen.

Is there a way to a) obtain information on which screen the application is currently running off of and b) force the dialog box to open on the same screen? Thanks in advance for any help and advice.

edit: using gtk2