>when developing apps 7 forms, Am I supposed to determine what screen mode is suitable for clients. I have an app looks good at 800x600 but does not fit all on screen at 640x480. How do I deal with other users who run my app and prefer 640x480?

Microsoft recommends "at least" 800x600; I think I read it in the "Windows 95 Style Handbook" (or something like that) from Microsoft Press. I use that as an argument for the 640x480 heretics!