This step-by-step article explains how to share a Microsoft Excel workbook with other users. If you want several users to work in the same Excel workbook simultaneously, you can save the workbook as a shared workbook. Users can then enter data, insert rows and columns, add and change formulas, and change formatting.
If you're in an application that gives you a link that you can click on, the spinning circle usually means that Windows is busy; it's doing something... it might very well be loading IE9. It's not until IE9 has finished loading that it becomes visible and takes over the screen.
Your computer processes data, stores it, and sends it to different peripherals and output devices. Computer science uses a few terms specific to this type of process: spooling, buffering and caching. These terms have specific meaning in computer science, but they're all similar functions. Many people -- especially non-programmers -- use them interchangeably. The specifics depend on the case.