Question about event handling in other forms

[itsme7]

Hello,
I want to make an application that starts another application and clickes on a LabelLink in that application. I have googled and found only how to do this kind of thing with clicking on a button. The event constant in button_Clicked is 245. So do I need to just know the event constant to LinkLable_LinkLabelClicked (I didn't find it in google)?

Here is the code for finding the link label and clicking it (but it doesn't work, probably only because I don't have the LinkLable_LinkLabelClicked constant):

//Get a handle for the LinkLabel
                hwndChild = FindWindowEx((IntPtr)hwnd, IntPtr.Zero, "LinkLabel", "MSN Messenger");
                //send LinkLabel_LinkLabelCLicked message. "MSN Messenger"-LinkLabel text.
 
 
                SendMessage((int)hwndChild, LinkLabel_LinkLabelClicked, 0, IntPtr.Zero); //LinkLabel_LinkLabelClicked- unknown constant.
 

Oh and another question: in order to find the link, does the last parameter have to be the LinkLabel text?
By the way, I used this article:
http://www.codeproject.com/csharp/WindowsAPIsFromCS.asp

Thanks in advanced.