2 questions: more than 1 port/device and other port than 161

2 questions: more than 1 port/device and other port than 161

Hi.
We want to get snmp data from a MS Enterprise Server.
First question:
Is it possible to get data from the standard MS SNMP Agent on port 161 and in the same device data from a third party agent, running on i.e. port 163?
If yes, then how?

Second question:
We have a third party agent running on port 163.
I can't get any data in OPManager on that port.
When I set the agent on port 161, OPManager ist getting data.
On port 163 never.
(By adding the device we told OPManager to use port 163)
What to do?
Roland