What is the commandbar "working model" and what does it do?

[audela]

I recently wrote a VBA app for a spreadsheet. As part of the App I wanted to
display the current sheet as full screen and remove all toolbars. I used
macro as a lazy way to generate the code and it generated the line:

Application.CommandBars("Working Model").Visible = False

This worked on my pc, but fell over when run on another pc: the debugger
identified this line as the culprit.

What I wanted to know is what the "Working Model" toolbar is and what it is
useful for.

Regards,

J