There are two extensions to to the standard described in the LAPACK User's Guide. First, all CHARACTER arguments are documented as being legal in upper-, lower-, or mixed case. Standard FORTRAN 77 does not allow lowercase letters, so the LAPACK User's Guide always documents arguments as being uppercase. The standard LAPACK source code, however, does process lowercase letters, so using lowercase letters will be portable to other hardware and software environments. CHARACTER arguments that are returned from LAPACK will always be returned in uppercase. Also, this version of Sun Performance Library contains a native C/C++ interface to LAPACK. Conventions for this interface are described in detail in the preface to this manual.