How-to install a program on MacBook?
DMG is a file type. You don't install a DMG, you open it. Maybe there is something inside the DMG that can be installed, maybe not. It is a common way to send many kind of files. It is a bit like .sit or .rar.You can make your own DMG files and save things inside them, and send the dmg to your friends. Use Disk Utility to make DMG files. The DMG size is selectable and can be as big as your free memory. It will appear on the desktop. You can put a password on it, but don't forget it! If you do, you won't be able to open the DMG!To open the DMG you made, just click on it. A disk Image will appear on the desktop just like a hard drive.Drag or copy files there. Eject it. The DMG file is still on the desktop. It is a file that you can email or copy to an external drive. Everything that you put in the disk image will actually be in the DMG file. If you don't want the DMG any more, drag it to the trash.Cool!