Cue file help

vbimport

#1

FILE “2.BIN” BINARY
TRACK 01 MODE1/2352
INDEX 01 00:00:00
TRACK 02 AUDIO
PREGAP 00:02:00
INDEX 01 02:08:71
FILE “1.BIN” BINARY
TRACK 03 MODE1/2352
INDEX 01 66:11:15

Does anyone know what the Index 01 represents in a cue file, what if i was to change that to 02 what that make it a new session. How can you make the cue file close the session and open another.