Does a virtual desktop app for Windows exist that is RDP/VNC compatible?

"This answer is probably too late by now, but there is mRemoteNG which supports the following protocols:

RDP (Remote Desktop/Terminal Server)
VNC (Virtual Network Computing)
ICA (Citrix Independent Computing Architecture)
SSH (Secure Shell)
Telnet (TELecommunication NETwork)
HTTP/HTTPS (Hypertext Transfer Protocol)
rlogin
Raw Socket Connections"

I don't know of any program that can do that and I don't see a great need for it. That is because you can open the VNC/RDP client on a secondary virtual desktop in window mode and click on the virtual desktop program system tray icon (on the virtual desktop taskbar) to switch between virtual desktops. This way you can one-click switch between a virtual desktop and the remote session desktop.