>Is there a way to sync files on two computers using a null modem cable with API from VFP? I tried using DirectCC but it crashes alot. So If I can read a directory on another computer from VFP via the null modem cable it will be easy to do the file sync from VFP.
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You need to make a network connection between the two machines - DCC is just another networking mechanism. VFP relies on the networking APIs, whether provided by a dedicated LAN, DCC or RAS to work with files on another computer. It doesn't have any inherent ability to drive a serial connection any better than DCC would have.

You might want to investigate a package like PC AnyWhere; it allows for similar functionality to DCC as well as remote control, and comes with a cable to make connections via the parallel port, which would be considerbly faster than via serial null modem connections.