Possible Duplicate:
What is the purpose of vshost.exe file?
What do the vshost files do?
Possible Duplicate:
What is the purpose of vshost.exe file?
What do the vshost files do?
vhost is a hosting process used by Visual Studio (read: you should not run it directly) that improves debugging performance, enables partial trust debugging, and enables design time expression evaluation.
http://blogs.msdn.com/b/irenak/archive/2005/12/19/505429.aspx