1  call!(args...; kwargs...) = error("Not implemented")
 2  
 3  start!(args...; kwargs...) = error("not implemented")
 4  stop!(args...; kwargs...) = error("not implemented")
 5  isrunning(args...; kwargs...) = error("not implemented")
 6  load!(args...; kwargs...) = error("not implemented")
 7  
 8  export start!, stop!, isrunning
 9  export load!
10  export call!, call!