In optical disc authoring, there are multiple modes for recording, including Disc-At-Once, Track-At-Once, and Session-At-Once.
A CD player will generally display a negative time offset counting up to the next track when such pre-gap introductions play.
It is also the only way to write audio files that link together seamlessly with no gaps, a technique often used in progressive rock, trance and other music genres.
The resulting disc can be read by computer drives, but sessions after the first are generally not readable by CD Audio equipment.
[1] The feature is only available on some models, notably the Yamaha's CRW3200[2] and CRW-F1[3] series, and Plextor's Premium 2.