The external server feature is activated by linking the Aqwa executable and an external process through a TCP socket. The feature requires the SUFC option to be activated. When both the SUFC and FDLL options are activated, the external forces calculated by both methods are summed.

The Aqwa executable sends data listed in External Force Calculation to the external process through the socket at each time step. Simultaneously, the Aqwa executable listens to the socket for the information generated by the external process