Unfortunately this discussion requires further clarification because the Flashback 3 is not just one product -- rather, it is a series of products.
There is:
* Flashback 3 - SE (secure edition -- intended to be installed directly into a laser projector by OEMs)
* Flashback 3 - XE (external edition -- intended to be connected to a PC and used along with LiveQUICK and LivePRO software).
* Flashback 3 - QS (brand new version -- intended to be used with the new Lasershow Designer QuickShow software).
If you have the FB3 - SE, we can assume that this is directly inside of a laser projector. Now, lets say you have some number of laser projectors, each with its own FB3 - SE installed. LivePRO can currently control up to six of such FB3 - SE. Lasershow Designer QuickShow can probably control even more.
If you have a FB3-XE or FB3-QS, a single one of these may be connected to several laser projectors with a Y-cable, much like you can connect multiple speakers to a single "left" or "right" output on a stereo.
And, similar to above, you can have more than one FB3-SE or FB3-QS connected to a computer.
In any event, it is possible to control more than one laser projector with the various FB3 offerings. It's only a matter of how much flexibility you want, and whether or not you want to spend the money on additional FB3s, when it is possible that a simple Y-cable will work (as long as you are OK with the same visual coming out of both projectors at the same time).
Best regards,
William Benner