frame-kind

frame <- kind: {toplevel,transient,popup}

What this frame is from the desktop's point of view:

toplevel â ordinary application window: title bar, can be minimised and resized through the OS. Default.
transient â dialog box / inspector window for a parent toplevel. Usually decorated but skipped from the task switcher.
popup â completely invisible to the OS window manager. Used for tooltips and popup menus. Cannot normally receive keyboard input; use transient if you need text input.
The kind can only be changed before frame->create.

See also
- frame->initialise
- frame->transient_for
- frame->show_label