The keys are not electrical pushbuttons such as those found on a computer keyboard. The user can type using only ASCII characters found on standard computer keyboard layouts. A keycap is a small plastic cover placed over the keyswitch of a computer keyboard. Her techniques have been adapted to computer keyboard typing. Original Speedwriting can be typed on a typewriter or computer keyboard. A virtual keyboard eliminates the need for a computer keyboard. This makes it unnecessary to go to the computer keyboard to enter text. A Samogitian computer keyboard layout has been created. Candidates input their answers using a computer keyboard. Conkeror is a Mozilla-based web browser designed to be navigated primarily by a computer keyboard. Music can usually be input using the mouse, computer keyboard, or a MIDI keyboard. The "home row" is the center row of keys on a typewriter or computer keyboard. In the Netherlands, a QWERTY computer keyboard layout is common. A special case of the computer keyboard dome-switch is the scissor-switch. Rollover is the ability of a computer keyboard to correctly handle several simultaneous keystrokes.