One embodiment of the present invention provides a system that avoids read-after-write hazards while speculatively executing instructions on a processor. The mark-making tool creator comprises a donor handler for receiving definitions of selected donor mark-making tools and a control value synthesizer. The method includes reserving a sufficient amount of the first amount of resources to allow a first participant of the plurality of participants to rejoin the conference when the first participant disconnects from the conference. Each partial intermediate circuit includes at least one driving motor connected by means of the corresponding motor frequency converter.