1 ASN
	The ASN command reassigns reads and writes to/from the Null handler
	NL: to files. (Writes to NL: normally just dissappear, Reads from NL:
	normally return a status of end of file, ^-Z)
 
	The ASN command lets one capture output from a program that normally
	only goes to TI for purposes of documentation. It also can be used to
	create the equivalent of an indirect command file for programs (such
	as ZAP,) which do not support indirect command files.
 
	MCR>ASN {dv:[n,m}}FILENAME.TYP=IN	:Change reads to specified file
	MCR>ASN {dv:[n,m]}FILENAME.TYP=OUT	:Change writes to specified file
 
	MCR>ASN =IN				:Close Input file. Input file is
						:also closed on EOF or if a pro-
						:gram sends a CLOSE I/O request.
 
	MCR>ASN =OUT				:Close Output file. Output file
						:is also closed if any program
						:sends a CLOSE I/O request.
 
	Note that ASN is very dumb and does no syntax checking, and does not
	report ony errors.
