[Libguestfs] Can I use libguestfs to pass some parameters into a KVM virtual machine

Hi, I have installed KVM in my RHEL5.3 box, and created some VMs on it. I am wondering if I can use libguestfs to pass some parameters/files into my VMs. As you may know, for Xen, I can use xenstore command to do this job, can libguestfs do the same thing? What I want to do includes: 1. Modify some configurations in my VM, such as editing /etc/sysconfig/network-scripts/ifcfg-eth0 to add a static IP for my VM. 2. Upload a script into my VM and run it in the guest OS. Is here any sample C code I can refer to? Any helps will be appreciated, thanks! Regards, Qian