A Remote Desktop Connection can be initialized with mstsc.exe.
Windows 7 and 10 allow only one remote desktop connection at a time. Windows Server does not have such a limitation.
RDP is a proprietary protocol from Microsoft. This protocol allows clients (such as laptops or desktop PCs) to connect to other computers and applications.
RDP is an extension of the T.120 protocol suite which defines standards for protocals that are used in point-to-multipoint communication, teleconferencing, videoconferencing and computer-supported collaboration.
The default listening TCP port that the server listens on is 3389.
.rdp files contain:
termsrv.dll patch to allow multiple connections on non-server OS