Access Serviio Media Server from Apple TV 3G over Home Sharing

Hi!

I have an Apple Airport Extreme based wifi network setup at my place.

One TV has an Apple TV 3G connected to it and another TV has an Apple TV 2G connected to it.

I have set up Serviio Media Server on my Window Vista laptop.

The Window Vista Laptop, the two Apple TVs and my iPad2 are in Home Sharing activated.

As of now, I can access media being streamed from the Serviio Media Server using my iPad2 and thereafter using Airplay, play the stuff from the iPad2 on either TVs through Apple TV.

Please educate me how I can access the Serviio Media Server directly from either of the two Apple TVs without taking help of (i.e. bypassing) iPad2 and Airplay.

Regards