How to get frames from HTMLDocument

Thanks Judah for taking time to give me some help. The problem is in the frames collection: frames.item(ref obj pvarindex) I don't know what this parameter (pvarindex) means and how to get my frames by their name. Like: "topFrame", "leftFrame" and so on. Any idea?

Would this work? mshtml.FramesCollection frames = ((mshtml.IHTMLDocument2)this.htmlControl.Document).frames; mshtml.IHTMLFrameElement singleFrame = (mshtml.IHTMLFrameElement) frames(someIndex).