如何编写多文档界面，实现剪切、复制、粘贴的功能-how to prepare multi-document interface, achieving cut, copy, paste function

使用PB编写的信息系统 适合初学者下载学习使用-PB prepared to use information systems suitable for beginners learning to use to download

The NCTUns network simulator and emulator is developed at NCTU, Taiwan. Its predecessor is the Harvard network simulator (invented by Prof. S.Y. Wang in 1999). By using a novel simulation methodology, it can do several tasks that traditional networ