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.
In order for this to occur, the circuit must have a return path, to keep cycling over and over again. The return path is simply called ground. For a circuit to loop over and over again it must have this return path, or ground, for it to do so. This is why a circuit must always have ground. Aside from this fact, ground also serves as a reference point in a circuit. It is a 0-volt line of reference.