Guest logical to physical translation is leveraged for host-side memory access. Trajectory hypothesis spawning allows for trajectory splitting andor merging and includes local pruning to managed hypothesis growth. HTML tags, or language data included in a particular protocol, e. A frequency conversion logic circuit is coupled to the CPU through a main bus and coupled to the timer through a peripheral IO bus. Such servocontrol by a hybrid method makes it possible to perform drive control of the stage having stability of the interferometer and accuracy of the encoder together.