unable to find MySQL server on local net (no replies)

Hello,

I'm a very new user of MySQL or any other DB.

I have two PCs running Win XP SP3 connected into a local network.
The two PCs are able to find each other.
I used windows installer "mysql-installer-community-5.5.28.2.msi".
On first PC I selected Full. PC IP is 192.168.0.4
On second PC I selected Client only. PC IP is 192.168.0.8
On first PC I was able to rich MySQL server (on local host) using IP 127.0.0.1 (I am a little bit confused).
On second, I tried using IP 192.168.0.4 and root user, or cristian user (already defined during server installation, but MySQL Workbench was unable to find the server.
How can I rich server from the second PC?

Thank you.
BR.
Cristian