It seems like you might be referring to Guake or possibly Kuake, which is a dropdown terminal emulator for Linux、Kuake is a KDE application that provides a terminal that can be toggled visible/invisible with a keyboard shortcut, much like the way a console is dropped down in some firstperson shooter games、It's very useful for users who need quick access to a terminal.

If you're asking about something else or have a specific question about Kuake or a similar application, could you provide more details?