Open System Preferences in the dock, and if you delete them, you can find them in your application.
Then in the personal directory, find expose and spaces, and open it.
Set the spaces first, and check the "Enable spaces" on the left to make the next setting.
This program is actually to divide a desktop into multiple, to avoid the desktop too messy. If you want this feature to be displayed in the menu bar, check the options below. A small icon like this will appear in the picture.
According to their actual needs to choose the number of rows and columns, the general 2*2 on it, more than nothing to use.
There are other settings that can be made under the Settings page, such as shortcut keys, which can be done by default or somewhat complicated. So if we don't need other settings to close it up.
Let's have a quick experience! Just set the shortcut key is what, just click, my is F8, the default also set this, drag each program window, will enter their own desktop, for the program to open too much is very helpful, Mac good features!