Active Desktop and MS DHTML was awesome. Insecure as hell for "consumers", but awesome. VBscript/Wscript on/in the desktop as an application was really useful.
My introduction to containers was HP-UX Vaults.
same as virtual machines were a thing in the early 70s and client-server in the 80s, but not for the target market despite the industry thought so for some time
But there wouldn't have been the hardware, resources, or depth of support available for the end user in the 2000s. There are still non-technical folks I deal w/ at work that don't get what a VM is...