A window can be either modeless or modal. A modal window (often a dialog) requires the end user to respond before continuing to work in the current application. A modeless window requires no such response.
You can display multiple modeless windows at the same time, and end users can navigate freely among them. Modeless windows remain displayed until they are dismissed by the end user or hidden programmatically. You can set the Hide on Exit property for a modeless window to specify whether it should remain displayed when the end user navigates to another window. Modal windows are usually used as dialogs, and have restricted functionality compared to modeless windows. On some platforms, modal windows are "always-on-top" windows that cannot be layered behind modeless windows. The Hide on Exit property does not apply to modal windows. Modal dialog windows cannot have scroll bars
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