swm (the Solbourne window manager) is an

X Window System The X Window System (X11, or simply X) is a windowing system for bitmap displays, common on Unix-like operating systems. X provides the basic framework for a GUI environment: drawing and moving windows on the display device and interacting wit ...

window manager developed by Tom LaStrange at

Solbourne Computer Solbourne Computer Inc. was originally a vendor of computer systems based in Longmont, Colorado, United States, at first 52% owned by Matsushita. In the late 1980s and early 1990s, the company produced a range of computer workstations and servers ...

in 1990. The most important innovation of swm was the introduction of the virtual desktop. It also introduced a primitive form of session management (restoring programs in use at the time of shutdown) to X.

References

* Thomas E. LaStrange (1990
swm: An X window manager shell
USENIX Summer. * http://users.polytech.unice.fr/~buffa/cours/X11_Motif/motif-faq/part4/faq-doc-1.html Free X window managers {{free-software-stub