Remember when OS X was first launched as a beta product, applications were displayed one at a time. When a multiple applications running at the same time, only one would can be shown on the desktop. This was called single-application mode. When you clicked on the icon of any running application in the menu, its windows would show up, while the windows of the other active application would be get back down into the menu.
Single-application mode kept desktop space looks unorganized. For that reason, Apple presented OS X the first release version with a multi-application mode as the default behaviour for the Finder and its desktop. That’s how we’re gonna use working with OS X and its new applications and have the windows of multiple applications open at the same time.
If you would like to try out single-application mode, it’s still available via a Terminal command.
Here’s how to activate it:
- Launch Terminal, located at /Applications/Utilities.
- Type or copy/paste the following commands into the Terminal window.
com.apple.dock single-app -bool true
- Press the return key after you enter each line of text. Note: There are only two lines of text. According to the size of your browser’s window, the lines could be wrapping and appearing as more than two lines. Be sure to enter them as two single lines.
Then you can see this message: Snow Leopard’s single-application mode is tied to the Dock, which means that switching from one application to another by clicking on Dock icons will launch single-application mode.