Bluetooth devices must be paired to each other for communication to occur. Bluetooth preferences in the System Preference application is responsible for pairing your Mac with Bluetooth peripherals. You can quickly open Bluetooth preferences from the Bluetooth status menu.
The diagnostic reporting feature automatically creates a diagnostic report log any time an application crashes or hangs. The diagnostic report log can be viewed immediately, reported to Apple via the Internet, or viewed later in the /Applications/Utilities/Console application.
It depends on the printer. From Printing & Scanning preferences, sometimes you can simply select a new printer driver from the Options & Supplies dialog. In many cases though, to select a new printer driver for a configured printer you must delete and then re-add the printer.