Im sure theres a lot going on under the hood so, not surprisingly, I would recommend reading the instructions...
Connectivity:
Using it on an existing wireless network is easy, it finds my existing network no problem.
Ad hoc network: once the network was created on the computer side of things I have had no problems what so ever getting my iphone to connect to the network, and getting i-clickr to find the network.
Bugs: heed their warning about bluetooth. I could not use the app w/ Bluetooth enabled and it did cause some extensive trouble shooting.
Senstic support: I read some other reviews which were critical of Senstics support. I did not have that experience, indeed, they replied within two hours to an e-mailed support request and their reply did solve the problem (bluetooth, per above).
Other problems: I have gotten the error "failed to load slide show, apple event handler error" (not helpful). When I try again it works. Not sure if this is on the side of the app, or within PPT or Apple.
sierra fan about i-Clickr Remote for PowerPoint