http://www.state-machine.com/qpc/history.html
Quantum Leaps releases QP Release 5.8.0
The main purpose of this milestone QP/C release is to finally provide the baseline framework fully compatible with the upcoming QM 4.0.0. This release changes the class hierarchy so that QHsm becomes the base class of QMsm and QActive. Also, QActive becomes the base class of Q