The end-user manually generated the crashdump.
Note There is a limitation with the Kbdhid.sys driver that allows for you to generate the memory dump process by using a USB keyboard. The CTRL+SCROLL LOCK+SCROLL LOCK keyboard shortcut does not work if the computer stops responding at a high interrupt request level (IRQL). This limitation exists because the Kbdhid.sys driver operates at a lower IRQL than the i8042prt.sys driver.
Note The USB keyboard feature can be used in Windows Server 2008 if Service Pack 2 or later is installed, or by installing the following hotfix: