Base on the research of virtual printer technology,the virtual printer system provides abundant secondary exploitation interface according to COM standard,in order to conveniently use virtual printer in third party system.

It describes the current major principles and algorithms on printing monitor and audit tech-niques,including API hook,driver hook,virtual printer and queue polling.

Design and implementation of virtual equipment and simulation system based on Java;

The research on virtual equipment and simulating system for microwave technique experiment is presented in this paper The necessity for virtual equipment and the simulating system is discussed The modeling of mathematics and basic means of achievement for virtual experiment are introduce

On virtual beer bottling production line is studied, on the large-scale virtual equipment and bottling production line is researched from the aspects of construction process and mold.

Approach for modeling virtual device library in VLAB;

Application and implementation of Linux virtual device in EPON system;

Meanwhile, introduce concept ofvirtual device logic to realize macro-decoupling of logic conceptand micro-decoupling of soft module, extensibility and stabilityof software are highly increased.