[ Thanks to Chris7mas for this link.
]
“Yakuake is a Quake-style console application, that
means it pops up just like the console in Quake (or other FPS
games) when you press the global shortcut F12. This one can be
changed to your likings. The good thing about Yakuake is that it
can use Konsole’s settings and it stays hidden until you need
it.”