         Parameters:  [at-col# {1}] [string {previous}]
  
 overlays  "string" onto the current line at the specified column
 (no leading space).  The column number "at-col#" defaults to 1. 
  
 If  "string"  is  omitted,  the  string  entered  on  the   last
 "Overlay-String" command is used again. 
