GetStage <quest id>
Used to get the current quest stage for given quest ID (use command ShowQuestTargets for IDs).
player.sqs <quest id>
Used to display all the stages of a quest
SetObjectiveCompleted <quest id> <stage value> <1 to set, 0 to unset>
Used to set the quest stage as being completed or uncompleted. Use command ShowQuestTargets for quest IDs and player.sqs to show how many stages there are. (Useful for bugged quests; e.g. if you picked up a copy of The Old Ways before you got the quest to do so you would use SetObjectiveCompleted MGR20 10 1 to complete the objective of getting the book, and SetStage MGR20 20 to advance the quest to the next stage).
SetStage <quest id> <stage value>
Used to set the quest stage (Useful for bugged quests). Use command ShowQuestTargets for quest IDs and player.sqs to show how many stages there are (note that you have set the stage one at a time in order to get its effect.)
Voila tout ce que j'ai sur les quetes, faut voir apres 