a. Give a short description of an existing stationary context aware application.
Amazon.com is an example of a stationary context aware application. When you visit amazon.com it may list the items you looked at the last time you where there or suggest new items that you might like. The context will therefore change for different visitors. Amazon also sends out mail to its users with products it believes that the users would like.
Another example of a stationary context aware application is the software that runs the blinds on Høgskolen i Østfold. When it is too bright outside the blinds will close, and when it is dark they will open up again. These blinds also have a neat random feature that makes the blinds go up and down at random intervals.
b. Give a short description of an existing mobile context aware application.
A portable weather station is context aware. These units can for instance report temperature, wind and humidity of the surrounding area.
c. Give a short description of an imaginary mobile context aware “killer” application.
For me a mobile phone or some other gadget that could report the precence of nearby rocks or cliffs would be a killer application. I have rock climbing / bouldering as a hobby, so this would be very neat.