**issue**

 - I'm a "data tester" and I test websites by writing SQL queries then using Excel to process the data and validate data during test execution
 - Sometimes we want to use R1C1 nontation in our VBA (e.g. 478,9) but usually we prefer A1 notation (e.g. I478)
 - Also, range objects return numbers (e.g. ActiveSheet.UsedRange.Columns.Count would return 9 not "I") but business people refer to "column I" never to "column 9"
 - The point is we need a way to convert R1C1 notation to A1 notation