Citrix Multiuser 1.0
Released in 1991 by Citrix Systems
For IBM PCs and compatibles.

Disk quality: Used/Installed

Citrix Multiuser is a customized version of Microsoft OS/2 1.21 that
turns it in to a real multi-user operating system. With Citrix
Multiuser, users can connect and simultaneously run character cell
based applications from remote serial terminals. To prevent users
from interfering with each other, it adds security permissions to
devices and files. It can use multi-port serial port boards like the
Digiboard, or any serial device that has OS/2 1.21 drivers.

Citrix Multiuser OS/2 does not support running Presentation Manager
based application or DOS executables, and programs can not use
graphics modes. It also does not have support for networking.

This product was released just days before the IBM-Microsoft
separation, which was an almost instant fatal blow as Citrix was
licensing OS/2 code through Microsoft.

As a result, Citrix Systems had to backtrack and instead focused on
making MS-DOS multi-user until eventually they released a Windows NT
based version.

To install on a faster computer, you must first apply the OS/2 speed
patches described here to the boot disk:
http://www.os2museum.com/wp/installing-os2-1-x-in-a-virtualbox-vm/

To summarize, replace all occurrences of:
  B8 F4 01 BB C8 00 F7 E3 F7 F1
with
  B8 F4 01 BB C8 00 F7 E3 90 90

It currently will not install in PCem (or some real hardware
apparently) due to a known bug with OS/2's FDISK. Unlike normal OS/2,
Citrix Multiuser's setup will not let you skip that.

The CSD update disks must be installed from maintenance mode. To do
that, use the Citrix Multiuser OS/2 boot disk, and after install
starts from the second disk, hit escape.

This archive contains four 1.2mb 5.25" installation disk images:
Disk01 - Installation Diskette
Disk02 - Diskette 1
Disk03 - Diskette 2
Disk04 - Diskette 3

The extras includes a Corrective Service Disk set as three 1.44mb
3.5" disk images. (CSD Level MU01091)
