This is equivalent to the RUN command, but intended for sky exposures rather than observations of astronomical targets.
2=to: 2!:}Format: SKY <channel> <time> ["<string>"]
2=to: 2!:}Channel: The name of the CCD data acquisition channel to be used.
2=to: 2!:}Time: The exposure time in seconds
2=to: 2!:}Title: A title for the observation (optional)
2=to: 2!:}Examples : SKY AUX 1.5 TITLE="Twilight"
2=to: 2!:}Comments: As for the RUN command, except that the observation type is set in the headers as being a sky flat field.