Add Excel Tab's option & Hung up Excel
Add Excel Tabs, what we use now days in the browsers. I think that will be very helpful to whoever works in the multiple excel files and try to move next excel with ALT+TAB. And unsaved data excel tab with highlight or asterisk sign, should be inbuilt.
Secondly, When we run huge data calculate in one excel and another one want to do something else, from the current excel situation we can't do that, until the 1st excel finished calculation. There we waste out time.