StackControl
return KPPPProtocol::StackControl(op, data);
virtual status_t StackControl(uint32 op, void *data);
status_t tmp = item->StackControl(fOp, fData);
tmp = protocol->StackControl(op, data);
status_t StackControl(uint32 op, void *data);
virtual status_t StackControl(uint32 op, void *data);
virtual status_t StackControl(uint32 op, void *data);
virtual status_t StackControl(uint32 op, void *data);