Host name resolution

Hi,

        We are running a polling daemon based on the netview OV libraries. These
scan the netview database for a set of entries to poll and the establish
snmp
session to each ip address using OVsnmpOpen.

The text version of the ip address is passed in to OVsnmpOpen and it does
the
resolution to an ip address.

Everything works wonderfully accept that if I remove the hostname -> ip
address
mapping from the hosts file I would expect it to fail when it tries to
resolve the
address, but it carries on using the old address.

All name resolution is done on the local machine.

Does anyone know of any caches that are kept that it could be using or how I
can
clear them. This problem even seems to persist across a reboot of the
machine.

Many thanks

Andy Pearce