Hi, can you explain the function of the program name.c which is located in \bind-9.3.1\lib\dns directory of bIND9.3.1 source code. also explain client.c mem.c, rdata.c , query.c , socket.c db.c, rbtdb.c files or give suggestions, where i will get more information regarding these files. Waiting for your reply.................... Thanking You