In GIN mode, terminal responds to each key stroke and hence no layout
command is functional. To perform GIN layout, position the cursor over 
the location or a layout entry (it doesn`t matter where the cursor touches 
the entry), then press the desired function key. The following is a list 
of defined keys (indicated in [ ]) for GIN layout:

[ENTER] or [T]:
     Enter lettering mode at the current cursor location. Then type in the
     text you wish to display following the prompt and press [RETURN] to
     enter the line. Press a numeric key before [ENTER]/[T] to set the
     size of text (size=0.04*N in). Default text size is 0.12 in, key [3],
     lettering path horizontal, color white. If other lettering path or 
     color is desired, resort to subsequent layout transform.

[.]: This is the dot key. Enter a point at the current cursor location for 
     drawing a line or a polyline or a curve. For a straight line, you need 
     to enter 2 points. If you enter more than 2 points, you get a polyline 
     or a curve. After entering all points, press a numeric key to connect 
     them. The number pressed designates the line type (default line type 
     is [1]) to draw the line. If you press [-] before the number, an arrow-
     head is attached to the 2nd point for a straight line, but a spline-
     smooth is fit through the polyline to produce a curve. To fill a poly-
     line or a curve, press a numeric key before [.] to designate the fill
     pattern.

[D]: Draw a predefined layout entry of ID from 1 to 7 at the current cursor
     location. Press a numeric key before [D] to designate the entry ID:

     1=bar, 2=box, 3=circle, 4=oblique, 5=polygon, 6=arrowhead, 7=symbol

[SPACEBAR]:
     Pick the layout entry touched by the cursor for transform.
     When picked, the entry is highlighted with blink-on. If already picked,
     it is released with blink-off. There are two GIN modes terminal operates
     in --- the locator-mode and the pick-mode. When GIN is invoked, terminal
     is enabled in the locator-mode. To pick a layout entry, it must be enabled
     in the pick-mode and this is automatically done the first time you press
     [SPACEBAR]. Therefore you need to press [SPACEBAR] twice to pick the 1st
     layout entry. Any other key pressed (except [DELETE] key defined to delete
     a layout entry) returns terminal to the locator-mode because terminal 
     responds rather sluggishly in the pick-mode. This auto-mode switch also 
     applies to entry delete with the cursor and [DELETE] key.

[S]: Another way to pick/select layout entries for transform is to enter two
     points defining the diagonal corners of a box with the cursor and the
     [.] key, and then press [S] key to pick up those entries in the box.

[M]: Move the picked entries to the current cursor location. The migration 
     will be the current cursor position minus that at picking the 1st entry.

[F1]: Flip the picked entries between visible and invisible.

[F2]: Release the picked entries.

[F3]: Refresh the screen.

[F5]: Set keypad into MOVE mode for layout transform. You can then press
      the numeric keys on keypad to move the picked entries bit by bit.

[F6]: Set keypad into ROTATE mode for layout transform. You can then press
      the numeric keys on keypad to rotate the picked entries around the 
      current cursor location bit by bit.

[F7]: Set keypad into ZOOM mode for layout transform. You can then press
      the numeric keys on keypad to zoom the picked entries about the 
      current cursor location bit by bit.

[F8]: Set keypad into COLOR change mode for layout transform. You can then
      press a numeric key on keypad to change the color of picked entries.

[F]: Set keypad into FILL mode for layout transform. You can then press
     a numeric key on keypad to fill the picked entries. The number pressed
     designates the pattern of area fill. Once filled, the picked entries
     are treated as a single entity called a fill group. To decompose a fill
     group, de-fill it with a pattern of zero.

[P]: Set keypad into CODE change mode for layout transform. You can then
     press a numeric key on keypad to change the pattern code of the picked
     entries. Enter "HELP CODE" in COMMAND mode to see what pattern code is.

     Enter "HELP KEYPAD" in COMMAND mode to see how keypad is defined
     for layout transform.

[C]: Copy the picked entries to the current cursor location. The migration
     will be the current-cursor-position minus that at picking the 1st entry.

[DELETE]: Delete the layout entry touched by the cursor.

[O]: Shift the working origin to the current cursor location. If layout scale
     is on, it will be moved together with the working origin.

[G]: Flip predefined layout scale on the working origin between on and off.

[B]: Flip highlighting/blink feature of pick event between on and off.

[F4] or [CTRL/Z] or [RETURN]: Exit from GIN mode.
