Do you mean auto load a webpage??
Insert a module (ALT f11, Insert Module) and add this code:
Code:
Sub OnSlideShowPageChange(SW As SlideShowWindow)
If SW.View.CurrentShowPosition = 1 Then 'or whatever slide number
'change target and maybe name of object
SW.View.Slide.Shapes("WebBrowser1").OLEFormat.Object.Navigate ("http://www.pptalchemy.co.uk")
End If
End Sub