Windows Nt 4.0 Terminal Server Edition -

The multi-user kernel introduced context switching overhead. A single user running a complex Excel macro wasn't an issue. Thirty users all hitting F9 in Excel simultaneously would peg the CPU. The solution was "scale up, not out"—you bought the biggest quad-processor (Intel Pentium Pro or Xeon) server you could afford.

: Unlike modern versions where terminal services are a role, NT 4.0 Terminal Server Edition was a separate development branch Service Pack Compatibility incompatible windows nt 4.0 terminal server edition

If you were to boot up a copy today on an emulator like 86Box or VirtualBox , you’d notice a few distinct details: The multi-user kernel introduced context switching overhead