Document that popen() uses a bidirectional pipe (in FreeBSD) and not a socket pair (as in Lite2).
Document that popen() uses a bidirectional pipe (in FreeBSD) and not a
socket pair (as in Lite2).

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase