In a client-server system, a server-node application runs a user session and a remote presentation protocol communicates between the client node and the server node. The server node stores a remote virtual desktop including remote windows of the user session. The client node displays multiple local windows of applications running locally on the client node and further displays one or more windows of the remote virtual desktop. The one or more windows are clipped to produce a clipped region so that the remote windows are displayed therein to appear as the local windows. The local windows are enumerated according to z-order from back to front and an area of each local window which overlaps the clipped region is subtracted from the clipped region so that the local windows show through the area.