[chandler767]

Applescript.

set the alert_message to "You may now plug in your DisplayLink device."
display dialog the alert_message buttons {"OK"} default button 1
set the my_choice1 to the button returned of the result
if my_choice1 is "OK" then
end if
on quit
	
	set the alert_message to "Unplug your DisplayLink device now."
	display dialog the alert_message buttons {"OK"} default button 1
	set the my_choice to the button returned of the result
	if my_choice is "OK" then
		tell application "Finder"
			continue quit
		end tell
		
	end if
	continue quit
end quit