[Xymon] Agent information

Hi Team

I am new to xymon and trying to learn about it. But I am unable to figure out few questions.

1. I run xymon client installation by apt-get. but can you tell me what is actually running or getting installed in my system is it a rpm or what?
2. how my agent works. how does it gains information from the system it is running on.
3. what is the architecture of the xymon.

I would really appreciate your help. Please give me the insight of the tool.

-- Thanks and Regards

*Sanjana *