agent X's role

Hello,

i've searched on google, but i did not really understood the interest of
AgentX when developping a subagent.
what can we do with agent X that you cannot with SNMP?
let say i have a midlevel manager which sends (forward) snmp get to
subagent.
these "get" can be made with snmp, so why should i send them with the agent
X protocol?
any links/tutorial other than the RFC would be appreciated.

thank you for your help,

--
Guillaume Desticourt