FALCEXTN is Falcon STOS Extension v. 1.2 by Anthony Jacques (dated
1995).  This is an extension that has been written to allow STOS to
take advantage of the new capabilities of the Falcon.  There is both
graphic and audio fixes here.  The docs are in HTLM format, but you
can still read them easily enough (or get an HTLM reader!).  The docs
cover how to use this.  If you are a STOS programmer and want to
write Falcon compatible programs get this!  Shareware.