>I have a Shell() command that I use in one project. When I use the same link in another project, I get:
>
>'Shell' is a type and cannot be used as an expression
>
>I am trying to figure out the requirement for this command to be used.

Are you sure you have not defined your own class named 'Shell' that is somehow referenced in that project? Simple repro:

Partial Public Class _Default
    Inherits System.Web.UI.Page
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Shell("Test")
    End Sub
End Class

Public Class Shell
End Class