Where exactly the Singleton Pattern is used in real application?

Question

I was just curious where exactly the singleton pattern is used... I know how the pattern works and where it can be used but i personally never used in any real application. Can

Answer 1

I used a singleton (actually a couple of them) in an application that used pureMVC. We were unhappy about the complexity this framework introduced (it became complicated and tiering to track method calls through the mvc layers). So we used a central singleton as a mediator to better separate the layers from each other.