Returns true if FriendUserId and UserID are friends. 

This method can be accessed through the Friends.asmx file located in:

~/Workarea/webservices/WebServiceAPI/Community/Friends.asmx

[SoapHeader("AuthHeader")]
[SoapHeader("RequestInfoHeader")]
[WebMethod(MessageName = "IsFriend", Description = "Returns true if the FriendUserId and UserID are friends.")]
public bool IsFriend(long friendUserId, long userId);

<SoapHeader("AuthHeader")>
<SoapHeader("RequestInfoHeader")>
<WebMethod(MessageName = "IsFriend", Description = "Returns true if the FriendUserId and UserID are friends.")>
Public Function IsFriend(friendUserId As long, userId As long) As bool