1 TPU_PLUS
 Several features have been added to the EDT interface to TPU.
 These features include split screen editting, learn mode for
 defining keys, centering text, and the display of characters that
 are not normally displayed. Much of the inspiration for these
 enhancements came features in the EVE interface. 

2 New_Key_Definitions
	CTRL/B		- Toggle between one/two windows
 	GOLD CTRL/B	- Open a reference file in top window
	GOLD UP_ARROW	- Move to top window
 	GOLD DOWN_ARROW	- Move to bottom window
	GOLD W		- Adjust relative window sizes

	CTRL/K		- Start a learn sequence for a key
	CTRL/R		- Finish a learn sequence

	GOLD C		- Center a line of text
	GOLD T		- Converts control characters to text

 	DO		- Execute a TPU command
	PF2		- Display this help
	GOLD V		- Display TPU version number
2 Split_Screen
 Type CNTRL-B to split the screen and edit in two parts of the same
 file (or two files) at the same time.  A second CNTRL-B deletes
 the second (top) window and restores the first file to full screen
 editting. Use GOLD-UP_ARROW and GOLD-DOWN_ARROW for moving the
 cursor between the two windows. Refer to REFERENCE_WINDOW for a
 special use of this feature. 
2 REFERENCE_WINDOW
 Type GOLD-CNTRL_B to automatically include a second file in the
 second (top) window of the screen. This file is READ ONLY, meant
 as a reference file. For example, when editting syntax errors in a
 source file, you will want to edit the actual source, and
 REFERENCE the listing file (compiler output) that contains the
 syntax diagnostics. 
2 WINDOW_SIZE
 Use GOLD-W to adjust the size of the windows. Specify a positive
 number of lines that are to be added to the main (lower) window
 (and thus subtracted from the secondary (upper) window, or a
 negative number of lines that are to be subtracted from the main
 (lower) window (and thus added to the secondary (upper) window. 
2 Defining_Keys
 Use CTRL/K to start a learn sequence for a key. Then type normal
 editting keys to perform the function to be learned. then type
 CTRL/R to finish a learn sequence. 
2 Center_Text
 Typing GOLD-C will cause TPU to center the current line of text
 within the current screen boundaries. 
2 Display_Control_Characters
 The EDT editor displays control characters in 'display notation'.
 For example, an escape character appeareds as '<ESC>', and a form
 feed as '<FF>'. TPU displays special characters in one of two
 ways. Either a single-cell size character will be displayed, if
 such a character exists, or a backward question mark will be
 displayed. In the later case, several non-printing characters are
 lumped together into this single character. 

 Typing GOLD-T cuases the entire buffer to convert backwards
 question marks into a sequence of characters. These sequences LOOK
 LIKE the EDT-style representation. However, there is a important
 difference. In EDT, the sequence '<ESC>' was truly one character.
 In TPU, the sequence is four character. The intent of the facility
 to to allow you to identify the control character. Type a second
 GOLD-T to convert the text back to the single character form.
