xTextIn Internal variables :

  These vars give you information on the latest xTEXTIN gadget
  to have been made current.

  $$TI.POS    - the cursor position in the current textin gadget
  $$TI.LENGTH - total length of string in the gadget
  $$TI.REC    - the string in the gadget
  $$TI.ID     - the ID of the gadget
  $$TI.GUI    - the name of the gui it's in