I'm searching for application (if exists). It should appear after pressing previously customized keys, and will have non-gui (aka command shell) (but it should be have 'buttons' like in GRUB 2), it should have some utilities like task manager, etc. It will be helpful when game crashed, and I can't move cursor, so I can't do anything (except Alt+Tab (but i can't do anything more after that) and resetting my computer).
I'm writing this 2nd time because I accidenly pressed 'back' button on my mouse. But Firefox is a crap, and after forwarding, my whole text dissapear lol.