Doubt in Hyperic HQ Installation for a network

[dvd.debian]

Hi,

can any one please clear my doubts?
I am very new to system monitoring...
even though the questions seems to be silly,
some one Please help!!!

I installed HQ Hyperic Version 4.2 Server and Agent
in my system.

My question s are :

1. If I want to monitor nearly 100 Systems in a LAN,is it
required to install the HQ agent in all the 100 systems?

If not how to monitor systems in a LAN..???

2. Consider my system name is A.
I have installed Hyperic HQ server and HQ agent in system A to monitor
my local machine.

If I want to monitor System B, how to proceed?
Whether HQ agent is required to be installed in System B
or a local HQ agent alone is required?


Thanks in advance!!