Editing Remote Desktop Protocol (section)

=== Version 4.0 ===
Based on the [[ITU Telecommunication Standardization Sector|ITU-T]] T.128 application sharing protocol (during draft also known as "T.share") from the [[T.120]] recommendation series, the first version of RDP (named version 4.0) was introduced by Microsoft with "Terminal Services", as a part of their product [[Windows NT 4.0]] Server, Terminal Server Edition.<ref name=":0" /> The Terminal Services Edition of NT 4.0 relied on [[Citrix Systems|Citrix]]'s MultiWin technology, previously provided as a part of [[Citrix WinFrame]] atop Windows NT 3.51, in order to support multiple users and login sessions simultaneously. Microsoft required Citrix to license their MultiWin technology to Microsoft in order to be allowed to continue offering their own terminal-services product, then named Citrix MetaFrame, atop Windows NT 4.0. The Citrix-provided DLLs included in Windows NT 4.0 Terminal Services Edition still carry a Citrix copyright rather than a Microsoft copyright. Later versions of Windows integrated the necessary support directly. The T.128 application sharing technology was acquired by Microsoft from UK software developer [[Metaswitch|Data Connection Limited]].<ref>Implementing Collaboration Technologies in Industry, Bjørn Erik Munkvold, 2003; Chapter 7</ref>