syntax signal/slots QT - question

I have some questions about signal and slots. First thing the syntax look like this:

Quote:

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connect(const QObject *sender, const char *signal, const QObject *receiver, const char *method, Qt::ConnectionType type)

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If i am not wrong:

const QObject *sender-> is the button that start the signal?
const char *signal, -> the signal
const char *method->element receive the signal
Qt::ConnectionType type-> slot
Other question i have, i can call the signal using emit or other way without buttons? thx again!

Please read the doc for QObject::connect and the doc for signals & slots.