As you said, there's no native TCP/IP support in MS-DOS. A number of companies sell their own implementations of a TCP/IP library for MS-DOS (both for 16-bit apps and for 32-bit MS-DOS extenders). Do a search for "IP stack MS-DOS" on the net to get some links. Some of the libraries (like for instance WATTCP) are free. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo