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Curated by: THE PHINTAGE COLLECTOR (262 videos)
Before Citrix teamed up with Microsoft to revolutionize enterprise computing with WinFrame, MetaFrame, NT 4.0 Terminal Server and Remote Desktop Services, they built something... different! In this episode, we dig into Citrix MULTIUSER — a multi-user extension built on top of Microsoft OS/2, long before Windows NT hit the scene. Installed and demoed inside 86Box, this early '90s relic reveals a forgotten lineage of terminal computing, OS/2 tie-ins, serial line wizardry, clear inspirations from the UNIX world and somes strange ties to Windows 3.0. We'll explore MULTIUSER 1.0 and 2.0, see what worked, what didn’t, and how it ties into the grander story of Citrix, IBM, and Microsoft’s complicated past. 🔔 Subscribe for more retro hardware adventures! 00:00 Intro 01:09 OS/2 Origins of Citrix MULTIUSER 03:04 Peeking around MULTIUSER 1.0 03:44 Users and Permissions 04:23 Multi-Tasking and process Control 05:34 Accessing MULTIUSER with Serial Terminals 06:38 Too Late To The Party: MULTIUSER 2.0 09:44 Windows 3.0 & DOS Support 11:45 Post MS & IBM Breakout - It's OS/2 2.x! 12:59 MULTIUSER Network Support Mystery 13:59 Another Shot At Serial Terminal Access 15:35 The Network Support Mystery Solved? 16:02 Conclusion Want to join THE PHINTAGE SUPPORTERS or THE PHINTAGE ENTHUSIASTS community and get a mention in an upcoming video? Learn more here: https://www.youtube.com/@THEPHINTAGECOLLECTOR/join This video was made possible with support by: THE PHINTAGE ENTHUSIASTS: Alisha Manuela Stutz @alishamanuelastutz Christian Zerrahn @JARVIS1187 David Shell @TheMinocula Waseem al sammane @wsammane ZyeByteVT @ZyeByteVT THE PHINTAGE SUPPORTERS: Balint Szy @balintszy Cecil @CecilFosfor HMK @hmichaelkraut7968 John Di Liberto @JohnMDiLiberto Jack Rosenthal @JackRosenthal1 Luke Granger-Brown @luke_gb Feldi @eudatux23 Matthew Veety @MatthewVeety MS-DOS Manfred @msdosm4nfred Steven Glogger @sglogger Tim Hull @hulltim2 WobinuFilms @WobinuFilms xcalibur839 @xcalibur839 Z098 @Z098 Visit also THE PHINTAGE COLLECTOR website at https://www.thephintagecollector.ch for insights into my retro computer collection. This presentation, Copyright @ 2025 THE PHINTAGE COLLECTOR, Gianpaolo Del Matto. All rights reserved. Individual Copyrights apply for referenced material (see sources). Music composed by 🎶 Abdallah El-Ghannam @AcrossTheU.S.A | https://www.fiverr.com/abdallahghannam 🎶 rootkitty | https://soundcloud.com/rootkitty ℹ️ Sources: About Citrix and Citrix MULTIUSER: https://archive.org/download/citrix-multiuser-promotional-video https://archive.org/details/citrix-multiuser-1.0-manuals/Citrix%20Multiuser%201.0%20Manuals/Citrix%20MultiUser%20Quick%20Reference%20Guide/ https://virtuallyfun.com/2017/11/26/citrix-multiuser-2-0/ https://archive.org/details/pcworld93unse/mode/2up?q=citrix+multiuser+manuals https://archive.org/details/byte-january-1991 https://en.wikipedia.org/wiki/Ed_Iacobucci Microsoft, DOS, OS/2: https://en.wikipedia.org/wiki/Microsoft https://en.wikipedia.org/wiki/OS/2 https://en.wikipedia.org/wiki/High_Performance_File_System https://en.wikipedia.org/wiki/Master_boot_record#System_bootstrapping https://www.os2museum.com/wp/os-2-2-0-spring-91-edition/ https://www.os2museum.com/wp/more-ms-os-2-2-0/ https://en.wikipedia.org/wiki/Gordon_Letwin MULTIUSER & MULTIUSER LINK: https://archive.org/download/CitrixMultiuser20 https://archive.org/details/citrix-multiuser-1.0-5.25-1.2mb.-7z https://winworldpc.com/product/citrix-multiuser-link/10 WinView: https://archive.org/details/professional-soft-collection-vol02-1995-classik-fond Wyse, Wyse 60, MacWise: https://en.wikipedia.org/wiki/Wyse https://www.carnationsoftware.com/domains/MacWise/Index.html