Change Indentation/Reverse

  Moves the line that the cursor is on one tab increment to the left and sets the
  new indentation of the current line as the current indentation level.

  If you press the Set Select_mark key to select a range of text, the
  Change Indentation key moves each line of text in the selected range one
  tab increment to the left.

  Command Equivalent:

          CHANGE INDENTATION/REVERSE

  Related Topics:

          DEFINE LANGUAGE/TAB_INCREMENT
          ENTER TAB
          SET INDENTATION
          SET TAB_INCREMENT
          TAB
          UNTAB