The explanation given in Qt-4.7.0 about auto connection type is (http://doc.trolltech.com/4.7/qt.html#ConnectionType-enum)
(default) Same as DirectConnection, if the emitter and receiver are in the same thread. Same as QueuedConnection, if the emitter and receiver are in different threads.

this is very unclear what is "emitter" reference to - an object or thread from it the signal is emmited.
After discussing this with Thiago Macieira on freenode I was explained that it refers to the thread from which the signal is emitted.

btw: in the previous versions it is much more clear that the reference is to the thread and not to the sender object. For example here: http://doc.qt.nokia.com/4.5/qt.html#ConnectionType-enum

Please provide more clear explanation of what it is.

Thank you in advance