7!:1 y 	Session. Maximum space used since start of session
7!:2 y 	Execute. Space required to execute sentence y

8  Screens, Fonts and Edit

8!:0 y 	Mode. Query CGA  (Except as noted, 8!: is only for PCs) 
8!:1 y  	Mode. Set non-CGA if y=.0; CGA if 1

8!:4 y 	Query Screen: Query screen attributes; a 4  by  2 table of values 0  to 15 interpreted (as in DOS) as follows: 

	Input area backgroundOutput area backgroundCursor bar backgroundStatus line background	Input area foregroundOutput area foregroundCursor bar foregroundStatus line foreground	0  Black   4 Red1 Blue      5 Magenta2 Green    6 Yellow3 Cyan     7 White8+i  Bright (backgd)       Flashing (foregd)
8!:5 y  	Set Screen Attributes
8!:7 y 	Refresh Screen
8!:9 y 	Edit: Applies editor to y, a string with lines delimited by  the line-feed (10{a.). Press F1 for 
help                                	             

8!:16 y  	Query Font attributes. (MAC only)   
8!:17 y	Set Font attributes. (MAC only).  
	Attributes are a 3-element integer list of the Font number, Style (a sum of one or more of 1 : Bold, 2 : Italic,  4  
: Underline, 8á:áOutline), and Size. Font attributes may also be set by Font, under the Edit menu

8!:19 y  	Print screen (MAC only)

9  Global Parameters

      Query                                                 	                Set

9!:0 y  Random Seed     		       	9!:1 y
9!:2 y     Default displays (See 5!:n)     		9!:3 y
9!:4 y     Input prompt 	 	     		9!:5 y  
9!:6 y     Box-drawing characters		        	9!:7 y

	Default values for the box-drawing characters are:

	õ à ÀÈ Ê ³Á  ã |  (For PC) +++++++++|- (For others)

9!:8 y     Error messages 	 	        	9!:9 y
                     For example, replace English messages (default) by French.
9!:10 y   Print Precision 	 	        	9!:11 y



11  Window Driver

See J User Manual

11!:0 y   	Window driver
13  Debug

See º I of Part II of Dictionary

13!:0  	Reset. Reset stack and disable (0) or enable (1) suspension
13!:1  	Display stack
13!:2  	Stop query
13!:3  	Stop set
13!:4  	Run again
13!:5  	Run next
13!:6  	Exit and return 
13!:7  	Continue at line number specified by argument

14  Data Driver

See J User Manual

14!:0 y	Source names	
14!:1 y	Disconnect
14!:2 y	SQL
14!:3 y	Fetch
14!:4 y	Columns
14!:5 y	Column names

14!:6 y	Source names
14!:7 y	Select
14!:8 y	End
14!:9 y	Error
14!:10 y	Transaction begin
14!:11 y	Commit transaction
14!:12 y	Roll back transaction
14!:13 y	Table

15  Dynamic Link Library

See J User Manual
x 15!:0 y	Call DLL function. 
  15!:1 y	Memory read
x 15!:2 y	Memory write
  15!:3 y	Allocate memory

  15!:4 y	Free memory

128  Numerical Functions

128!:0 y  	QR decomposition of a complex matrix y in the domain of  matrix inverse (%.). The result is an Hermitian 
matrix and a square upper triangular matrix, individually boxed

128!:1  y    	Invert square upper-triangular matrix