Hi there!
I ' writing a HTML page and now I need a button which can help me log in my skype . Could I do that ?
What shall I do if I can ?

Well, here is a way to start Skype automatically if it is not running via HTML:

http://testing.onlytherightanswers.com/skypebeta/Client.htm


There are other examples as well here:

https://developer.skype.com/Docs/Skype4COM/Example

Thank you . That's the first step of my programe . Can I use these buttons in my application or can I develop a plug-in board into my skype ? Now I want to use the skype API to achieve the function of group
conference , what shall I do ?

yes, look here for conference call syntax:

http://www.skype.com/share/buttons/advanced.html

Shall I log in through my application but not the Skype client ? For example , I have developed forum and I want to use one ID and password to log on my forum and skype at the same time through my forum logging on column