A computing system includes a first client computing device, and a virtual desktop server. The first client computing device displays a local client surface, and a virtual client surface provided by the virtual desktop server. The virtual desktop server provides a real-time media application to provide real-time communications (RTC), and an API code redirection module to redirect intercepted APIs of the real-time media application intended for a native RTC engine based on redirection code injected into the real-time media application so that the portion of the real-time media application is redirected. The injected redirection code enumerates the local and virtual client surfaces. The first client computing device shares the local and virtual client surfaces with a second client computing device based on the intercepted APIs enumerating the local and virtual client surfaces.