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] or [MOUSE_UNSHIFT_MIDDLE]:
     Enter "TEXT" mode to write a text line at the current cursor location.
     Dialogue prompt will change to "LAYOUT_TEXT>". Then type in the text 
     line you wish to display and press [RETURN] to enter the line. Press 
     a numeric key before [T] to set the size of text ( size = 0.04*(N+1)
     inch ). Default text size is 0.12 in, key [2], line path horizontal,
     color white. If other line path or color is desired, resort to 
     subsequent layout transform. 
     Following control sequences can be embedded in the text line:

     { --- Convert the next non-blank character to superscript.
     } --- Convert the next non-blank character to subscript.

     \sTEXT_STRING^s  --- TEXT_STRING to be italics.
     \bTEXT_STRING^b  --- TEXT_STRING to be boldface.
     \#TEXT_STRING^p  --- TEXT_STRING to be colored in pen code #.

[.] or [MOUSE_UNSHIFT_RIGHT]:
     Enter "DOT" mode to draw lines or curves or to select layout entries 
     in a window. Dialogue prompt will change to "LAYOUT_DOT>". More help
     information is available in the "DOT" mode.

[SPACEBAR] or [MOUSE_UNSHIFT_LEFT]:
     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.

[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.

[L]: Set keypad into LINE mode for layout transform. Yon can them press
     a numeric key on keypad to change the line types of picked entries.
     The number pressed designates the number of the line type.

[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.

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

[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.
