PTPd can coordinate the clocks of a group of LAN connected computers with each other. It has been shown to achieve microsecond level coordination, even on limited platforms. The 'ptpd' program can be built from the included source code. To use the program, run 'ptpd' on a group of LAN connected computers. Compile with 'PTPD_DBG' defined and run with the '-C' or -V argument to watch what's going on