Overlay files?

Hi,
Thanks for the info.
Now i'm just curious whether it's possible to attach a DLL file to an EXE file and make it Overlay file!

Then the Exe should call for dll file which is overlayed.
Shall the DLL file be extracted info the Temp folder or not?


@dj-siba's
I want to know how it was possible to make OVL files in OLD DAYS.
Is there any Special Command?

Thanks in davnace.
Regards,
Android.