/NAMES

  Specifies how the compiler treats the case of identifiers and how
  it represents external (global) names to the linker.  HP
  recommends using the ATTRIBUTES ALIAS directive rather than /NAMES
  to specify the form of external names.

  UPPERCASE
    Tells the compiler to ignore case differences in identifiers and
    to convert external names to uppercase.  This is the default.

  LOWERCASE
    Tells the compiler to ignore case differences in identifiers and
    to convert external names to lowercase.

  AS_IS
    Tells the compiler to recognize and distinguish case differences
    in identifiers, including the names of NAMELIST groups and
    variables in those groups, and to preserve the case of external
    names.  This option also prevents the compiler from recognizing
    intrinsic functions unless they are specified in uppercase.