In general, F12 serves as a shortcut to open developer tools in most web browsers. Additionally, F12 can be used for other purposes in different applications, like opening the "Save As" dialog box in Microsoft Office programs.
What Does F12 Do. Access the list of bootable devices during startup so as to change boot order. Open the Save as window in opening Microsoft Word. Open the document open window in Microsoft Word by pressing Ctrl + F12.