How can you name a slide and then refer to it by name in a hyperlink?

[John Wilson]

The SlideiD should never change.

If the SlideIndex changes the iD takes preference and so the link will work even if the slide is moved to a new position.
You probably do not need to specify the title.

So, to create a link to the CURRENT slide 2

With oshp.ActionSettings(ppMouseClick)
    .Action = ppActionHyperlink
    .Hyperlink.SubAddress = CStr(ActivePresentation.Slides(2).SlideID) & ",2,Title"
End With

OR more generic

With oshp.ActionSettings(ppMouseClick)
    .Action = ppActionHyperlink
    .Hyperlink.SubAddress = CStr(ActivePresentation.Slides(2).SlideID) _
    & "," & CStr(ActivePresentation.Slides(rs_AbsolutePosition + 1).SlideIndex) & ",Title "
End With