[u124556]

Workspaces! I've been using them in Linux since 10 years ago.

[troymc]

Here's the Wikipedia article about their history:

https://en.wikipedia.org/wiki/Virtual_desktop

[paol]

More like 20 years. They were in FVWM when I made first contact with linux around 1995 or so.

They were in Unix's CDE too, which I presume would have been even earlier than that.