a) A video file.

b) In keying, the trigger point or range of a key source signal at which the key or insert takes place.

c) The control that sets this action. to produce a key signal from a video signal, a clip control on the keyer control panel is used to set a threshold level to which the video signal is compared.

d) In digital picture manipulators, a manual selection that blanks portions of a manipulated image that leave one side of the screen and “wraps” around to enter the other side of the screen.

e) In desktop editing, a pointer to a piece of digitized video or audio that serves as source material for editing.