APEX provides three types of pages till APEX 20.
- Modal Dialog
- Non-Modal Dialog
To create these pages Select Page Mode. change desc little bit
The page is presented as a normal Application Express application page.
Model Dialog Pages
The page is presented as a modal dialog. A modal dialog is an overlay window positioned within the viewport, which remains active and focused until the end user dismisses (closes) it. The underlying page is grayed out and the end user is prevented from interacting with the rest of the page until the dialog is closed.
Non-Modal Dialog Pages
The page is presented as a non-modal dialog. A non-modal dialog is an overlay window positioned within the viewport, where the end user can interact with the dialog, and content on the page that launched the dialog. A non-modal dialog can be used when the requested information is not essential to continue, work can continue elsewhere while the window is still open.
Note that options Modal and Non-Modal Dialog will only be available for selection where the current application theme contains a default Dialog Page Template.