I have random program numbers in a cell in each row for example in R4,C4,
406518,417615, 42586. I need to run through all the rows with a loop to
check that there are no duplicate numbers in any of the other cells. I need
an inner and an outer loop. I have the outer loop I think. I need to
compare the first line cell contents and then run through every row to make
sure the first program numbers aren't in any other cells. Then I need to
proceed to the second line compare those numbers with every other line
through the end of the spread sheet ensuring that there are no duplicate
program numbers in the 2nd column.

Here is all I have so far:
Sub ckDups()
Range("R1C2").Select
Do While ActiveCell.Value < ""
???????????
ActiveCell.Offset(1, 0).Select
Loop
End Sub

thanks very much