sync watched items

Hello,

i would like to know if there i a way to sync all my watched items with my XBMC installed on my iMac.

Here is how i set it up:

My iMac is in my room. connected to an external HDD. This HDD contains all my content. When im at school i connect to my home network trough VPN and watch alot of shows. Now when i get home i watch (instead of my school laptop) everything else on my iMac (also installed XBMC).

Is there a way to let the 2 XBMC's communicate with each other to tell one of them if a show is already watched?

thanks,