i use

OpenUrlL(const TDesC &aUrl, TInt aIapId=KUseDefaultIap, const TDesC8 &aMimeType=KNullDesC8)

in my code but there is a problem about this.

Are "aIapId" and "aMimeType" important for url.they change for every url?
What are they means?

Can someone help me?I need more information about playing audio by connecting url!!!