A given name  is  a  string  of  up  to  31  characters.   The  legal
  characters  in  a  given  name  are  A-Z,  0-9,  _, and $.  The first
  character must be a letter from A-Z, and the last character cannot be
  _ or $.  The DMU translates all lowercase letters to uppercase.

  For example,  SALES  and  CDD$TOP  are  legal  given  names.   S{L?S,
  however,  is  not  a legal given name because it contains the illegal
  characters { and ?.