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TECO-10 has the following extensions to DEC standard TECO:

Long q-register names:	Q-register names may be up to 6 characters long
			The traditional single-character q-register names
			may be used, or up to six characters in parentheses.
			i.e.	Qq	or 	Q(FOOBAR)	.
			Legal characters in q-register names are:
			A-Z, 0-9, dollar-sign, space and underline.
			A q-register name consisting entirely of
			zero or more spaces is the same as q-register (),
			which is special and discussed below.  For clarity,
			macros should use the Q() form rather than Qspace.
			Note that trailing spaces are discarded,
			lower case is converted to upper case,
			qA and q(A) (where A here represents any of the
			above characters) are the same q-register,
			Q-registers containing any printing characters
			other than those listed above are legal, but reserved.

EWfilespec/APPEND$	Appends to the output file if it exists,
			create it otherwise

EQ(q-reg)filespec$	Read a file directly into a q-register.
			Nulls are not removed as the file is read in.

E%(q-reg)filespec$	Write a q-register out to a file. Nulls are
			not removed as the file is written out

The q-register with the null name: () is the text buffer.  The numeric
part of this q-register is the value of "." .

Q-registers may share their text with each other and with the text buffer
as a result of "[" and "]" commands.  When a q-register is pushed onto
the q-register pushdown list, all that is pushed is the numeric value
of the q-register and a pointer to the text, if any.  Thus, a command
such as: [A ]B would cause q-registers A and B to share the same text.
The commands: X, ^U, and EQ could be applied to either q-register
without modifying the other, since the q-register is un-bound from
its previous text first.  However, the colon-modified forms of
X and ^U append to the existing text, so a :X or :^U command for
either of them would affect the other.
Furthermore, the sequence:  [A ]()  causes the q-register to share
with the main text buffer.  The old main text buffer is lost unless
it is also sharing with a q-register or is saved on the q-register
pushdown list.  The text in q-register A becomes the text buffer
and the numeric value of A is used for "." if it is in range,
otherwise "." is set to 0.  Now any modifications made to the
text buffer will also affect q-register A, because they both have
the same text.  Some examples follow

	[() [A]() J@I"FOO" ]()	!This inserts "FOO" at the beginning
				 of q-register A. The original text
				 buffer is unaffected, the pointer
				 position in the original buffer is
				 preserved, as is the numeric value
				 of q-register A!

	[() zj-5t  ]()		!The last 5 lines of the text buffer
				 are typed, and "." is restored!

Other commands:		(Some of these may not work on TOPS-20)

m,n:^T	This does an arbitrary TTCALL (with a few exceptions):

0:^T	(INCHRW)	Read a character in character mode. Stall if necessary.

m,1:^T	(OUTCHR)	Type (m) as a character.

2:^T	(INCHRS)	Read a character in character mode. NEVER stall.
			Return -1 if no character
4:^T	(INCHWL)	Read a character in line mode. Stall if necessary.

5:^T	(INCHSL)	Read a character in line mode. NEVER stall.

m,6:^T	(GETLCH)	Get line characteristics for line m (-1 = yours).

m,7:^T	(SETLCH)	Set line characteristics:
			Bits returned by m,6:^T :
			^O400000000000:		Pseudo-TTY
			^O200000000000:		CTY
			^O100000000000:		Display
			 ^O40000000000:		Dataset
			 ^O10000000000:		Half-duplex
			  ^O4000000000:		Remote TTY
			  ^O2000000000:		Remote batch (??)
			   ^O100000000:		A line has been typed in
			    ^O20000000:*	Lower case input accepted 
			    ^O10000000:*	Hardware TABS
			     ^O4000000:*	Local Copy
			     ^O2000000:*	Paper TAPE mode

			The argument to m,7:^T is the desired state of
			the above bits added to the line number (or
			^O777777 for your line.
			Only the starred (*) bits can be set by m,7:^T.

8:^T	(RESCAN)	Attempt to re-scan the command line that invoked
			TECO10.  Return -1 if successful, in which case
			subsequent terminal input commands of any type
			will read the command line.
1,8:^T	---		Return -1 if TECO10 was run at the "CCL entry point",
			i.e. chained to by another program such as COMPIL.

9:^T	(CLRBFI)	Clear type-ahead.  Useful if macro detects an error.

10:^T	(CLRBFO)	Clear pending typeout. Equivalent to user typing ^O.

11:^T	(SKPINC)	Return -1 if a character has been typed, else 0.

12:^T	(SKPINL)	Return -1 if a line has been typed, else 0.

m,13:^T	(IONEOU)	Type (m) as a character without discarding parity bits.

E&dev:program-to-run$	Run this program when we exit. Can take a numeric
			argument which is the run-offset. 0 is the default.

m,nE*	(TRMOP.)	Does an arbitrary TRMOP. to your terminal.
			Not available on TOPS-20.
			m is used as the new value for setting functions
			and is ignored if not needed.  See the TOPS-10
			Monitor calls documentation for an up-to-date
			list of functions.  A few are listed below.

1E*			Return non-zero if terminal input buffer is non-empty,
			else return 0.
2E*			Return non-zero if terminal output buffer is non-empty,
			else return 0.
^O1003E*		Return non-zero if terminal is using lower case.
1,^O2003E*		Set terminal to use lower case.
0,^O2003E*		Set terminal to not use lower case.

^O1005E*		Return non-zero if terminal is using hardware TABS.
1,^O2005E*		Set terminal to use hardware TABS.
0,^O2005E*		Set terminal to not use hardware TABS.

^O1006E*		Return non-zero if terminal is using hardware FORMfeed.
1,^O2006E*		Set terminal to use hardware FORMfeed.
0,^O2006E*		Set terminal to not use hardware FORMfeed.

^O1007E*		Return non-zero if terminal is set for local copy.
1,^O2007E*		Set terminal to use local copy.
0,^O2007E*		Set terminal to not use local copy.

^O1010E*		Return non-zero if terminal is doing free CR/LF's.
1,^O2010E*		Set terminal to do free CR/LF's.
0,^O2010E*		Set terminal to not do free CR/LF's.

^O1011E*		Return the horizontal carriage position.
			The monitor is usually confused about this,
			as it does not know of the behavior of display
			terminals.  Perhaps you want the FX command.

^O1012E*		Read the terminal WIDTH. Same as 1:W unless you
			did something behind TECO10's back.
m,^O2012E*		You probably want to use m,1:W.
			That way the display code knows about what you did.

^O1021E*		Return non-zero if terminal has PAGE set.
1,^O2021E*		Set terminal to PAGE.
0,^O2021E*		Set terminal to NO PAGE.

^O1021E*		Return non-zero if terminal has PAGE set.
1,^O2021E*		Set terminal to PAGE.
0,^O2021E*		Set terminal to NO PAGE.

^O1022E*		Return non-zero if output frozen (i.e. by ^S)

^O1023E*		Return the page length (as in TTY PAGE m).
m,^O2023E*		Set the page length to m.
			Note that some monitors use this value to
			automatically freeze output after every n
			lines.  This is probably not the behavior
			you want.  It can be supressed by 0,^O2023E* .

^O1026E*		Return non-zero if terminal has ALTMODE set.
1,^O2026E*		Set terminal to ALTMODE.
0,^O2026E*		Set terminal to NO ALTMODE.
			This feature, if set, converts old altmodes to ESC.

^O1036E*		Return non-zero if terminal has RTCOMPATABILITY set.
1,^O2036E*		Set terminal to RTCOMPATABILITY.
0,^O2036E*		Set terminal to NO RTCOMPATABILITY.
			If set, this allows ^R and ^T to be passed to the
			program, rather than being intercepted by the
			operating system. ^R is normally passed to TECO10
			anyway, because of the way the terminal is opened.