csrss.exe - Necessary

%sysdir%\csrss.exe

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Description:

%sysdir%\csrss.exe
Csrss.exe is the user-mode portion of the Win32 subsystem (with Win32.sys being the kernel-mode portion). Csrss stands for client/server run-time subsystem and is an essential subsystem that must be running at all times. Csrss is responsible for console windows, creating and/or deleting threads, and some parts of the 16-bit virtual MS-DOS environment.