I used a command a while back and can only vaguely remember how to use it. I
was using the SumProductIF. I have a column of references and I need to count
how many times the reference is used.

For example:

Date Reference Amount #of Lines per Ref
12/31/09 Payroll 12/09 50.00 2
12/31/09 Payroll 12/09 100.00 2
12/31/09 Sales 12/09 2,000.00 3
12/31/09 Sales 12/09 5,000.00 3
12/31/09 Sales 12/09 10,000.00 3

#of Lines per Ref is the total of how many times that reference is used in
the whole spreadsheet.