If you need to know a saved wireless network password on a system running Apple's OS X operating system, e.g. a MacBook Pro, you can do find that information using the Keychain Access program found in
Applications/Utilities. To find the information using that
utility, open it, then click on Edit then Find and
search for the
SSID for the wireless router or click on Passwords under
Category in the left pane of the window and look for it in the
list you will see. You can then double-click on a relevant entry to see
the password/key. Alternatively, you can use the command line
security program with the find-generic-password option
to display the password.
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