Not exactly. If one of the frames is another hta, it asks "Open or download". I tried iframes, but I am having the same problem. Microsofts web site implies that if you use "special attribute on the <FRAME> or <IFRAME> tag that is unique to HTAs. By specifying TRUSTED=YES, the HTA infers all of its privileges upon the content it navigates into the frame. " But it doesn't say how to use this "special attribute".
Thoughts?