<P> Banner grabbing is a technique used to glean information about a computer system on a network and the services running on its open ports . Administrators can use this to take inventory of the systems and services on their network . However , an intruder can use banner grabbing in order to find network hosts that are running versions of applications and operating systems with known exploits . </P>
in order to grab an os banner you would use
network hosts that are running versions of applications and operating systems with known exploits