| PCBIErrorOccurred | The event if a internal error occurs. |
| PCBINewDesignHistoryLog | The event handler is called, when a new design history log is created |
| PCBIWarningOccurred | A new warning is added to the ErrorLog. |
| PCBIWindowCreated | The event handler is called, when a new IPCBIWindow (with or without UI) is created |
| PCBIWindowDisposing | The event handler is called, when an existing IPCBIWindow is disposed |