I'm starting to get the hang of it. I guess a little advice is needed on my part. The programs I'm writing are to automate process and the users are not involved in any way, unless you count me or some other tech person who would be starting and stopping them. There are some forms with buttons and textboxes so that monitoring can take place, but for the most part these are completely hands off, no user interface required (or allowed) whatsoever. I am adding a new module to my project this morning which will be passed a stream of data, parse it and then open an instance of Excel. It will populate some cells in the Excel file and then gather up the calculations made by Excel. This data will then be written to a file, or streamed back to the webpage which sent it. My thinking is that this Excel stuff should be in a module. Or would there be advantages to having it in a class?