But a geek would tell you, it isn't Microsoft's Process Explorer is it? It's part of the legendary Sysinternals suite developed by every geek's saviours : Mark Russinovich and Bryce Cogswell.
All Kudos to Sysinternals! - All hail the finest suite of tools I cherished above all others!
Lest we forget, I for one, stand to salute them!