Hi, I have a VMM application using a homegrown client for communicating with hypervisor. I am planning to migrate to libvirt because of the blocking nature of the calls. After going over the architecture, I would like to have a few doubts clarified 1) Should my application be necessarily multi-threaded in order to make use of the non-blocking calls in libvirt. [Are overlapping methods mainly used by multithreaded clients]. 2) I was wondering if there was any way to provide a callback along with the methods to achieve non-blocking.[My application has event library so it can receive events] 3) Is the libvirt RPC client multi-threaded. [i.e., does it internally use multiple threads to dispatch requests to server and return response to the application] I can provide more information, if its not helpful. Thanks Arvind