public void RemoveProcess(IProcess process)
		{
			if (process==null) return; // TODO: think if this is appropriate (SD)

			if (process.ExecutionState != ProcessExecutionState.Finished 
				||process.ExecutionState != ProcessExecutionState.Stopped)
			{
				// TODO: handle exceptions
				process.Abort();
			}
			
			_processes.Remove(process);

		}