are arranged into horizontal lanes called <dfn>tracks</dfn>. Tracks are
stacked vertically in the Editor window. You can copy, shorten, move,
and delete regions without changing the actual data stored in the session
are arranged into horizontal lanes called <dfn>tracks</dfn>. Tracks are
stacked vertically in the Editor window. You can copy, shorten, move,
and delete regions without changing the actual data stored in the session