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A-Shell Reference

[ Type code = b ] This prevents blanks from being entered into the field. This code also alters the way the Rubout (or Backspace on most PCs) key works. Normally it erases the character to the left of the cursor, leaving a blank if it was in the middle of the field. Since we do not want to allow blanks here, it just acts like a left arrow when in the middle of the field.