DESQview 2.70
Released in 1995 by Quarterdeck
For DOS

DESQview, from Quarterdeck, was a DOS application multi-tasker and in 
later versions functioned as an X client for applications on remote 
UNIX systems. It competed against IBM Topview. The original DESQ was 
just a task switcher, but subsequent versions offered preemptive 
multitasking of well behaved DOS programs on real-mode 8088 PCs. It 
gained popularity when DESQView 386 added virtual x86 support. This 
enabled the ability to multi task many poorly behaved programs, and 
was often used on BBSes due to its excellent COM port handling. It 
was later overtaken by OS/2 and Windows.
