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You can set Task manager not to display the red line in<br />
Display -&gt; Show Kernel Times 
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You can set Task manager not to display the red line in
Display -> Show Kernel Times

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I am running a real-time simulation on a laptop (Windows 2000) &nbsp;that is networked to a second &nbsp;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.<br />
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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). &nbsp;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.<br />
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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?
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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?

CPU Usage History with Task Manager displays a second red plot

Windows 2000 is an operating system for use on both client and server computers. It is the successor to Windows NT 4.0, and is the last version of Microsoft Windows to display the "Windows NT" designation. Four editions of Windows 2000 were released (Professional, Server, Advanced Server, and Datacenter Server) that shared a core set of features, including many system utilities such as the Microsoft Management Console. All versions of the operating system support NTFS 3.0, Encrypting File System, as well as basic and dynamic disk storage. The Windows 2000 Server family includes support for Active Directory services, Distributed File System and fault-redundant storage volumes.