Do not be concerned with frame embedding at this time. There are many other pieces to chew off first. Frame embedding is part of native window handling and in particular also enables the Tcl plugin (http://plugin.tcl.tk/) to function correctly (this embeds Tcl/Tk into IE and Firefox). Once upon a time this was not possible on Windows without strict constraints. I believe that Chengye Mao did significant work in this area for 8.5. In fact, I have to revert some of the changes for the Tcl plugin to work again, but haven't gotten around to that.
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Do not be concerned with frame embedding at this time. There are many other pieces to chew off first. Frame embedding is part of native window handling and in particular also enables the Tcl plugin (http://plugin.tcl.tk/) to function correctly (this embeds Tcl/Tk into IE and Firefox). Once upon a time this was not possible on Windows without strict constraints. I believe that Chengye Mao did significant work in this area for 8.5. In fact, I have to revert some of the changes for the Tcl plugin to work again, but haven't gotten around to that.