[lproven]

HP had several innovative GUIs of its own, before Microsoft destroyed the market with a good enough one of its own.

NewWave was its first and long predated even Windows 3.

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

HP was once a UI and GUI pioneer and did other quite radical stuff.

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

TabWorks wasn't an HP thing -- it just bundled it with some consumer Compaq kit.

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