说明：  VB检测判断网络上指定IP的电脑是否开机，想想就会明白，其实原理很简单，使用PING命令就可轻易实现，如果能PING的通，那当然说明电脑就已经开机了，否则要么是网络问题，要么是电脑没开机，不过要想继续判断究竟是网络问题或是用户未开机那就另当别论了，当然，或许代码里用了其它的方法，这个只有看了代码才知道。
(VB on the network test to determine whether the specified IP boot the computer, think it will understand that the principle is very simple, use the PING command can be easily achieved, if they can PING the pass, then of course explain the computer is switched on, otherwise, either the network problem, or the computer did not boot, but in order to determine whether a network problem or the user is not on, it is another matter, of course, perhaps code used other methods, there are only looked at the code can tell.)