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'''Client/Server Runtime Subsystem''', or <tt>csrss.exe</tt>, is a component of the [[Windows NT]] family of [[operating system]]s that provides the [[User space|user mode]] side of the [[Windows API|Win32 subsystem]] and is included in [[Windows NT 3.1]] and later.<ref name="GDI"></ref> Because most of the Win32 subsystem operations have been moved to [[kernel mode]] [[Device driver|drivers]] in Windows NT 4 and later, CSRSS is mainly responsible for [[Win32 console]] handling and GUI shutdown. It is critical to system operation; therefore, terminating this [[Process (computing)|process]] will result in system failure. Under normal circumstances, CSRSS cannot be terminated with the ''taskkill'' command or with [[Windows Task Manager]], although it is possible in Vista if the Task Manager is run in Administrator mode. On [[Windows 7]] and later, Task Manager will inform the user that terminating the process will result in system failure, and prompt if they want to continue.
== Malware hoaxes ==
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== History ==
The [[Windows NT 3.x]] series of releases had placed the [[Graphics Device Interface]] component in CSRSS, but this was moved into kernel mode with Windows NT 4.0 to improve graphics performance.<ref name="GDI">{{cite web
|url=http://technet.microsoft.com/en-us/library/cc750820.aspx#XSLTsection124121120120
|title=The Windows NT 4.0 Kernel mode change
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