Its been quite a while since I've taken a proctored exam, but then all the proctors would clear all the memory on your calc before they'd let you use it for test. Is that not the case anymore?
Depends on the exam. Some don’t even allow programmable calcs because they don’t want to deal with possible shit like this. I have already seen a certification exam where they provide the calculators as well.
The launcher program can be downloaded on-demand, avoiding detection if a teacher inspects or clears the calculator's memory
If I understood it correctly, the Wi-Fi module appears as a standard calculator-to-calculator interface, so built-in commands can install the cheat apps at any time.