What is the recpient of a mediator?
The recipient of a mediator is the agent to which the mediator sends the reduced query.
How do I fill in a class that can be viewed using Standard (seek/frontdoor/etc)?
In Kiosk, the recipient of Standard is a facilitator. You haven't learned about facilitators yet, but you can think of them as transformers that can have multiple recipients. The way to make something show up in Frontdoor is to make it a specialty of an agent that knows about it. Then the facilitator will know to send reduced queries to that agent.
My system is running really slow and crashing a lot. Please help.
Kiosk uses a lot of memory because there are a lot of facts in the warehouse (cities, colleges, etc.) Try removing the facts you don't need to do your development. Also, if you are still running query rules from (for example) your read-in-XML from last time, then try materializing your data. This should save a lot of computation, plus you can then remove the old XML data, which might be taking up a lot of memory.
I'm getting round-off error, for example (* 0.1 40 3.999999). What should I do?
Use the round function. For example, (round 3.999999 4).
One of my object handles is colliding with another. (I.e. I have a car named victoria, but this is also a state.)
You should avoid these handle collisions whenever you detect them. Assuming that you only have a few such collisions, you should use rules to rename your handle to, say, victoria.car.