Is there a way to move the active cell through the current selection using
an external program? I'm trying to get a data capture program I have
written to update the active worksheet's cells. I would like the user to
select the cells to be updated, then my program will hopefully update the
active cell then move to the next cell in the selection the same way the tab
key does.

The following code shows my problem. The Goto method changes the selection
and doesn't do the same thing the tab key does.

' Get Excel instances
Set a = GetObject(, "Excel.Application")

' Set text of active cell
e.ActiveCell.Value = "Hello, World!"

e.Goto e.ActiveCell.Next