Hi David ,
I do not know what you are talking about ; you have posted more than 200 entries , all related to Excel formulae ; you have asked these in isolation , and got answers from probably a dozen members ; each of these answers has been provided in isolation , each member not knowing where the formula solution provided fits into the overall picture.
You are therefore confident of integrating all of this to give yourself a working application.
Where does the commerciality of all this come in ? Are you intending to put out the entire application as a commercial product ? If so , what is the security of formulae vis-a-vis the security of VBA ?
Anyway , my point was that whether you use a single line of code or a thousand lines of code , the objective is to develop a robust application which performs ; if at all VBA is acceptable to you , then using VBA you would have been up and running by now , since what you have been trying to do getting formulae from various members over the past several months , could have been done better using VBA in a matter of weeks.
Narayan