Reading directly from a binary excel file (I'm assuming that is the spreadhseet app you are using), is fairly involved. It can be done, and there is source code available from the open-office project to guide you. As Analog implied, if you were to save your spreadsheet (save a copy) as a text file, it is really easy to read it in. However, that instance of the spreadsheet will lack equations, sheets, and any of your graphs.
Sheldon
Technical geek, engineer, research scientist, biodegradable...