You can solve the problem by cutting a large opening in a basement wall and adding a window that meets code requirements for egress. You'll find contractors willing to do this work, often for between $2,000 and $3,000, or you might consider doing it yourself.
Caps Lock is a button on a computer keyboard that, when pressed, causes all letters to be generated in capitals until deactivated. It is located in the position of a similar Shift lock key (and sometimes a Ctrl key) found in some other keyboard layouts. It is usually a toggle key: each press reverses its action.
Keyboards often include a small LED to indicate that Caps Lock is active, either on the key itself or in a row with Scroll lock and Num lock indicators. While on the original IBM PC keyboard this LED was controlled by the keyboard itself, it is under software control of the computer since the introduction of the IBM AT.