I have same HyperLink :
HyperLink skype = new HyperLink(); skype.NavigateUrl = "skype:username?call";
When user press it he redirects to skype window to user account, which entered in NavigateUrl. I try to find something for ICQ in google, but fail. Does anybody know how to link to ICQ account?
Try this URL:
http://www.icq.com/whitepages/cmd.php?uin=4655465&action=message
Replacing the UIN with the one you want, and the message with the one you want.
Obviously it only works if they have ICQ installed.