in reply to
Remote OS Detection
I would use nmap to do that.
This may not be the best approach, since they have legitimate access to the systems in question. See A practical approach for defeating Nmap OS-Fingerprinting.
IIRC there are other more subtly ways of achieving this sort of thing.
Also nmap may not be an option. Yesterday pankaj_it09 asked if it was possible to use Nmap::Parser without having nmap installed on the host system.
I make decisions, and my brain carries them out
My brain makes the decisions, and I observe them (if I'm lucky)
I make some decisions, and my brain makes others
My spouse makes decisions and I and my brain carry them out
I wrote a program to relieve me and my brain from the burden of decision-making
The black-helicopter people project the decisions into my brain and then I do as ordered
Results (485 votes),