Hi @brotherkennyh, thanks for your query. In fact, we are currently working on providing multi-monitor support into our next generation of eye trackers but this will not apply unfortunately to the current commercially available range of consumer eye trackers (4C, Eyex)
Accordingly, please keep an eye on Tobii announcements on our website for upcoming details.
One possible workaround you could consider (which is not officially supported!) if you have the hardware could be to place two computers side by side each with an eye tracker connected running a singular keyboard and mouse shared via software such as Synergy Plus. However even in this scenario, there may be infrared interference from the parallel trackers that could affect performance.