I'm trying to figure out what this code does. Can someone tell me what
Column(R6C[5]) indicates? Is that cell E6? Thanks. The formula seems to be
working, but it formula is extracting data from column N. Does Column(R6[5])
indicate column N? Thanks for your help.

If Selection.Locked = False Then ActiveCell.FormulaR1C1 =
"=if(ISERROR(VLOOKUP(RC3,IPDD!IPDD,(Column(R6C[5]) -
column(R6C3)+1),FALSE)),"" "",VLOOKUP(RC3,IPDD!IPDD,(Column(R6C[5]) -
column(R6C3)+1),FALSE))"