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kyoungjoo son: my customer wants to call messenger program like skype or windows messenger in the application.
Not exactly this, but Skype does by default install extensions for handling its own URLs so you can trigger a Skype call from a link on a page. Search the web for information on Skype callto links. Maybe Messenger does something similar, I haven't checked it.
For more extensive interaction with external applications, you would probably need native browser plug-ins.