JC Denton can figure out the killswitches for each as the storyline progresses, he decrypts Anna Navarre's killswitch "Flatlander woman" on his escape from UNATCO headquarters, and Gunther Hermann's killswitch "Laputan machine" after speaking to Jaime Reyes in Paris.
What I want to know is, do these even mean anything? Searching it up online, I fail to find much information about Anna Navarre's killswitch code, and for Gunther's killswitch it seems to also be an achievement in DX:MD, but nothing more.