In the Mac operating system, hitting the tab key while in an open or save dialog box tabs you through to the filename and highlights it. So say you want to save a new file, you hit save as and then a save dialog pops up. If you hit tab, the file name becomes active and highlighted and you just start typing your filename.
This function is a time saver, especially if you deal with a lot of files. In ProDrools, this doesn’t happen. Tab does nothing. But ProTools isn’t about saving time, it’s about taking MORE time, so your big expensive studio can bill your client more hours and make more money, thus helping you afford your overpriced recording system.