1). I don't think there is an online demo. The only demo you can access would be one that would have to be downloaded to really get a feel for it. Especially if you want to test tickets, chats, and other areas, you would need to have it on your own servers.
2). Multiple brands, meaning you can have one instance for multiple companies. For example, at Fun.com (my company and the parent company), we have 3 different main brands: Fun.com, HalloweenCostumes.com, and Shirts.com. Because using one portal for all three wouldn't work, we have the flexibility to have a portal for each (and any others we decide to add in the future).
HalloweenCostumes.com: http://support.halloweencostumes.com
Shirts.com: http://support.shirts.com
Fun.com: http://support.fun.com
Note: my team here did a lot of custom CSS and Javascript since SmarterTrack isn't custom friendly, which is why ours looks completely different than the default look(s).