Venting vs Complaining

When should a person listen to their friend vent and when should they just sit the other person down and tell them to stop complaining?

I see the need for human beings to vent from time to time - it's not healthy to let aggravating thoughts simmer inside forever. But I feel like complaining is a waste of time - I kick my butt into action whenever I see myself doing it, and as a result, I feel the need to kick other people's butts into fixing whatever they're complaining about.

I suppose "venting" is more about having someone listen to you while you sort out the logical cause of your negative feelings, while complaining is just saying to the world what you don't like without the intention of trying to attempt resolution.

Am I wrong in this thought?

And I do see the irony of me venting/complaining in this post.