A second option that is available is the Update Changes option. This function simply allows you to define how often the spreadsheet changes are updated. The most common element users use is the Update Every 15 minutes. What this does is to force a save and filter through the data to all the users. One point to consider is that if you workbook is relatively large and you are working on a slow computer you may want to increase that time to 30 minutes. The last area of concern is the Save Changes function. This defines whose changes will override who‘s. There are two options available which say, Ask me Which Changes Win and The Changes Being Saved Win. Which option you choose really depends on the type of workbook you have created.
If a user tries to open a Workbook that is already open, then they normally get a message saying that the File is locked by a certain user and would you like to open the file in Read only mode. However, you can open a workbook in shared mode by following these steps. First open the file that you want to share, then once the workbook is open, go to the Tools menu and choose Share Workbook from the drop down menu. The Share Workbook dialog box will now appear. To enable sharing, you simply click once on the Allow Sharing check box, so that it has a tick. Once you do this other people will now be able to use your Excel workbook whilst you are working on it.