m_search_api_class

Syntax:         int m_search_api_class(unsigned ClassGroup, char far *String, 
                                           unsigned Len)
Parameters:     unsigned ClassGroup - Declared as a manifest constant (in INTERFAC.H).
                char far *String - String to match 
                unsigned Len - Length of string to match 
Returns:        The class number 
                ERROR_INVALID_CLASS_TYPE (-1) - if the ClassGroup number is invalid
                ERROR_CLASS_NOT_FOUND - if the class is not found
Comments:       The convention established to implement this function is to reserve 
                function number 0 in all classes to be used as the identification 
                function.  Function 0, if available, is of the prototype 
                int far Fnct0 (char far *String, unsigned Len) and returns 0 if the
                identification string matches.  Function 0 returns -1 if the 
                identification string doesn't match.