What feature of Excel VBA am I using when I address cell "A1" as Cells(1)?

Its INDEX!
Cells(1) assumes the 1st cell in column 1 when no argument is specified.
Cells(1) = Cells(1,1)

In a range...
Range("A1:D8").Cells(1) refs A1
Range("A1:D8").Cells(32) refs D8
Range("A1:D8").Cells(16) refs D4
Range("A1:D8").Cells(8) refs D2

...where count is left-to-right, top-to-bottom

--
Garry

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