There are many ways to launch Mac OS X applications, including the following:
If you have used a Mac before, you have probably used many of these methods to open applications. Most of them are very straightforward and require no discussion. A couple of them, though less often used, can be effective techniques for quickly opening an application. NOTE The first time you launch an application under Mac OS X, you will see a dialog box that explains you are opening the application for this first time. In this dialog box, you'll see the name of the application that is trying to open, along with tools you can use to control it. The primary purpose of this is to warn you when an application first opens so you can confirm it is a legitimate application and not some Trojan horse or other application that is trying to launch without your knowledge. If you want to proceed with opening the application, click Open. If you aren't sure about the application, stop the process and check it out before opening it again. One of the most powerful methods although it's underused by many Mac usersis to launch an application by drag and drop. Macintosh drag and drop is a function of the OS whereby you move information from one location to another by simply selecting it, dragging it to where you want it to go, and then dropping it. The drag-and-drop approach is especially efficient when you want to open a document with an application that wasn't used to create it initially. For example, if you receive a plain-text file and double-click it, it opens in TextEdit. If you want to open it in Word instead, you can simply drag and drop the document onto Word's icon and Word is used to open the file. Otherwise, you would have to first open Word, use the Open command, maneuver to the text file, and then open it. (You could also use the Open With command by opening the document's contextual menu.) If the file type is compatible with the application on which you drag it, the application icon becomes highlighted to indicate that it is a compatible file. TIP You can force an application to attempt to open a document with which it is not compatible by holding down the Option and keys while you drag the document onto the application's icon. If the application is capable of opening files of that type, the file is opened. If not, either the application still launches but no document window appears or the document window appears and is filled with garbage. You can also use drag and drop to open documents using applications installed on the Dock. Simply drag the file you want to open onto the icon on the Dock for the application you want to use to open it. If the application is capable of opening the document, its icon becomes highlighted. When you release the mouse button, the application launches and the document is opened.
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