I am running a real-time simulation on a laptop (Windows 2000) that is networked to a second computer where the simulation process on the laptop is in Ethernet communication with another process on the second computer. This description is deliberately vague and is only intended to show that the CPU on the laptop is very busy when this simulation is running.
My question is about the Task Manager utility on Windows 2000. When the laptop is being used for normal purposes the CPU Usage History graph (Performance tab) is plotted in green color and is usually very low (i.e. 1-5% usage). When observed with the simulation running it's usage is 25-30% plotted in green but there is also a second plot in red that tracks with the green but somewhat lower in value.
I can not find anything in the Task Manager Help file that discusses the meaning of this second red plot within the CPU Usage History graph. What is it's meaning?