Sorry, you'll have to be more clear. ALT-TAB works in Linux like it does in Windows; which is to swap from one open application window to the next. Are you saying that you have some distribution with a certain window manager and when you minimize you don't see icons? Because Ubuntu latest does something like that. If you have a toolbar with a shortcut to an application, upon minimize it shows your shortcut with one or more dashes next to it, designating the amount of open windows you have on that. And clicking on the shortcut, in that case, will show the app window again.
But it really depends on what exactly you're running and what it's going.
Try ALT-TAB first to see if you "see" the app windows be able to be re-shown.