Select - All

Click the Home > Select > All command or the   Home > Select > Select > All  command to select all of the objects in the model. The total number of objects selected is displayed on the status bar. Be careful using this command. The command does not select only the objects shown in a particular window, but rather it literally selects all objects in the model.

TIP:  This command is a useful technique to determine the total number of objects in a model.