如何用C#做类似于MSN，常驻在屏幕右下角的应用程序？

如题。
问题一，
比如我点了主窗口上的（关闭）按钮，程序的窗口都关掉，然后在屏幕右下角出现我这个程序的图标。点了它以后可以再打开程序窗口。问题二，
另外，我的程序是运行在那里的，socket通信。接收到socket消息之后，怎样让屏幕右下角的图标一闪一闪？同时有声音提示？这个就象MSN的效果，，要怎么实现？有什么参考的教程，例子么？

解决方案 »

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http://blog.csdn.net/lincomin/archive/2006/10/08/1325849.aspx
二、当接收到消息之后，不断改变托盘的图标。
http://www.51cto.com/art/200509/3974.htm
1 NotifyIcon控件
2 改变NotifyIcon的ICO
一搜一大片

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1 NotifyIcon控件
2 改变NotifyIcon的ICO
同意这个：
1 NotifyIcon控件
2 改变NotifyIcon的ICO