svchost.exe - Necessary

%sysdir%\svchost.exe

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Description:

%sysdir%\svchost.exe
Svchost.exe (Windows NT/2000/XP) is a generic host process name for services that are run from dynamic-link libraries (DLLs). The Svchost.exe file is located in the %SystemRoot%\System32
folder. At startup, Svchost.exe checks the services portion of the registry to construct a list of services that it needs to load. There can be multiple instances of
Svchost.exe running at the same time. Each Svchost.exe session can contain a grouping of services, so that separate services can be run depending on how and where
Svchost.exe is started. This allows for better control and debugging.
More info:
http://support.microsoft.com/support/kb/...