Groupid:
You could use something like:
P 1766nnnn 00 xxxxxxx
or
P 066Ennnn 00 xxxxxxx
P 2068nnnn 00 yyyyyyy
or
P 685Ennnn 00 yyyyyyy
if it helps you to remember...
So whatever you want it to be as long as it is unique in your file. Two groups can not have the same groupid, obviously because then they would be in the same group.Where: groupid = any 4 hex digits signifying unique group for all channels using the same keys.
(Leading zeros not necessarry, but makes viewing the file easier...)
You could use something like:
P 1766nnnn 00 xxxxxxx
or
P 066Ennnn 00 xxxxxxx
P 2068nnnn 00 yyyyyyy
or
P 685Ennnn 00 yyyyyyy
if it helps you to remember...