v3 tool commands

[Eoin O'Sullivan]

Hi All,
I apologise for this basic question, but I'm new to
snmp v3. I have built a basic agent with snmp++,
including v3. I can successfully do mib walks and
use snmpGet, the tools included with snmp++, but only with
snmp versions 1 and 2.
What is the syntax to 
(1) set up a new user in V3 from the command line or agent code
and (2) the syntax used in an snmpGet -v3 command?
I understand I have to make changes to the vacm, but haven't been 
able to do this successfully.

Thanks,
Eoin