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Your comment reminds me of HP's obscure EFI OS called QuickLook. I would guess there are a lot of obscure OSs out there.
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Oh, yeah! I think ASUS also had something like that at some point.
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I believe you are speaking of Tabworks?
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I had to Google and it does look like it, I remember the computer would boot into it and it also had space for a few (three?) icons outside the tabs (like in the “desktop”). It was a cool interface!
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I don't think I've heard of an alternate shell/launcher like that before. Do you remember what it was called?
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Windows still (well, Win2000) lets you build a custom shell, just replace explorer.exe (and a bunch of other work).
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I've heard of custom shells for Windows before, but not that specific one
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