Multi frame calibration

[hagorms]

Hello!
I have several cameras and would like to calibrate their position alltogether.

I use this answer http://www.agisoft.com/forum/index.php?topic=4076.msg21014#msg21014  to calibrate cameras individually.

But I have some question about agisoft:

1) Is camera position  optimized for all camera frames?

2) if i use your gui to load photos to chunks and than combine chunks in frames, how does agisoft understand which photo belongs to which camera?

3) Can I somehow calibrate camera position, if i don't have any frame for the timestamp (the calibration board can't be seen at the same time from camera 1 and camera

Best regards. Matvey.