Command line RDP client

Hello, I need a "hidden" rdp client. This rdp must be a command line executable, i.e. working on a virtual (in-memory, not visualized) framebuffer. I need this because, i will configure an user that in autostart has an app working on a legacy app. Currently, this app is working on the console of a PC, but i can't have a PC dedicated for this app, so i want it to work through rdp connection. But i can't have another PC dedicated to keep this rdp client opened, so i want a command line executable that connects to the RDP server and waits for the rdp session to end, then exits. I need this executable working for Windows 10 PRO RDP (also Windows Server 2012) A plus is to provide a second app that simply attachs to an existing RDP session and simply displays (doesn't interact in any mean) what's going on. A plus is the executable also working (if properly recompiled) on Linux also. A plus is if the executable is provided as library i.e. used through scripting languages like vbscript. Thanks a lot and happy bidding, Pierpaolo