[libvirt-users] Qemu-guest agent

Hi all, I am new to libvirt, I am trying to execute some commands inside guest domains from my host machine using libvirt-Python API. So far I have been able to open up a stream but I am not sure how to send commands on the stream (through virDomainOpenConsole). After hours of searching through different forums I found out that there is a utlity called qemu-guest agent which can solve my problem. But I am not sure how to enable this agent on host and domain, and how this will be used to communicate to guest domains. Any help in this matter will be really appreciated. Thanks