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u4error((int)error_num,(char*)string1,(char*)string2,...)
u4file_first( (char *) pattern, (char *) first_match )
u4file_next( (char *) next_match )
u4lock( (int) dos_file, (long) offset, (long) num_bytes, (int) do_wait )
u4name_char( (char) test_char )
u4name_full( (char *) result, (char *) name, (char *) extension )
u4name_part( (char *) result, (char *) name, (int) give_dir, ... )
u4open( (char *) file_name, (int) code )
u4sort( (void *) base, (size_t) num, (size_t) width, ..)
u4unlock( (int) dos_file, (long) offset, (long) num_bytes )