... "which allows web applications to run independently" ...
... "It’s about running it in a separate process" ...
that seems to be what i'm reading from the proponents. however, when i run multiple "Prism" apps on my windows box at the office, and i execute "Process Explorer" (from SysInternals), i see only *one* "xulrunner.exe" in the Task List.
and if i kill that single xulrunner process, guess what? it killed all three of my "individual" Prism apps - same behavior as if i launched multiple browser windows.
granted, the memory footprint is small, but i can achieve that with Opera or K-Meleon.