INT 60 u - HP 95LX System Manager - IDENTIFY FILENAME REFERENT
        DI = 050Bh
        STACK:  2 WORDs unused dummies (for calls from high level languages)
                DWORD   pointer to ???
                WORD    ???
                WORD    ???
                DWORD   pointer to ???
Return: ???
        STACK unchanged

Values returned:
 0000h nonexistent
 0001h file
 0002h directory
 0003h character device