.TEXT SET TXT MARGIN:R 
This subroutine sets the right  margin for the text in the "current" Text Object .
  Usage: 
      PASS         <right_margin>             FIELD            SHARE? N
      GOSUB    0CD .TEXT SET TXT MARGIN:R
      *        Check for error
      IF       0CD .TEXT SET TXT MARGIN:R     NE
  Description: 
This subroutine sets the right margin for the text in the "current" Text Object.
The parameter is optional. If specified, it must be an unsigned integer in the range 1-99999. It represents the margin in pixels. A blank will be reset to the default. By default, the left and right margins are approximately half the font width, and the top and bottom margins are approximately 1/4 of the font height.
You can also use 
.TEXT SET TXT MARGIN:L, 
.TEXT SET TXT MARGIN:T and 
.TEXT SET TXT MARGIN:B to set each margin or 
.TEXT SET TXT MARGIN to set all the margins at once.
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-- 
JeanNeron - 2011-11-18