Often, a script calls other scripts, in the same way as it calls built-in commands.

In the below example, called scripts are highlighted.

Public Shared Sub MouseWheel(ByVal App As IShellApp, ByVal Page As IPageDisp)

  Dim delta As Double = App.GetWheelDelta()

  If AddInUtils.IsControlKeyPressed Then

     Page.ViewZoomWheel(delta)

  ElseIf AddInUtils.IsShiftKeyPressed Then

     Page.ViewZoomImage(delta)

  Else

     Fred.ScrollWnd()

  End If

End Sub

It is rather difficult distinguish calls to GN4 built-in commands, VB.NET built-in commands, from calls to scripts.

Some instructions can be found in Distinguishing calls.