Gives the ability to quickly check if your character has completed a quest by using it's Quest ID.
Makes checking quest chains from Wowhead or any similar sites quick and painless ingame.
Sample commands
/checkquest 12345
/cq 12345
/cq https://www.wowhead.com/quest=44555/khadgars-discovery
Output to chat
CheckQuest: The quest 12345 has been Completed on this character.
CheckQuest: The quest 12345 is Incomplete on this character.
CheckQuest: The quest 44555 has been Completed on this character.
CheckQuest: The quest Khadgar's Discovery (44555) has been Completed on this character.