说明： 该程序是在labview7.1中实现子窗口调用的例子，类似于VC++的多文档操作，这是虚拟仪器软件开发中比较难的一点 (that the procedure was achieved in labview7.1-call window example, VC similar to the multi-document operation, which is virtual instrument software development more difficult to the point)
