Where the data resides in Express?

Hi, I have a group of students working in their mandatory Software Project course, the goal being to sort of integrate collaboration and daily tasks (messaging, calendar, todo-list etc.). I guess this sounds quite familiar on this list - and we will probably indeed use REBOL extensively. Particularly the forthcoming REBOL Express seems to be interesting. But there isn't much information about it available and the group's work is in the late requirements phases - not good for waiting a couple of weeks. So can someone possibly further clarify some aspects of Express? The main question I have in mind just now is: where does the data reside typically in Express? For example, if you have a couple of Conferences reblets open, is the data in centralized server and then cached to the terminals, possibly with quite simple caching rules? If this is the case, how much control would our group have over the caching mechanism (e.g. one research project at HIIT deals with things like intelligent caching and prefetching…)? And how does the server store and give the data? Is it essentially as a database? Could we for example make an UI which would integrate the messages from multiple Conferences? Another important question is about the email: in listed reblets, nothing is said about it. I’m quite certain that there however exists reblets for dealing with email? And that the Express Server deals with it too? Cheers, Mikko Mäkelä