There are several ways to link your PDA to your PC, so you can synchronize information between the two. USB and serial cables are two of the most common methods. A USB cable is faster, but requires a newer Pentium computer with USB capabilities.
Most models come with a serial cable, which is a bit slower but just as dependable.
You can also link through an infrared port, which beams information via light signals without cable hook-ups. Infrared is slower than a cable connection. Finally, you can link with a docking station. The PDA fits snugly into the docking station's cradle. However, the amount of memory you need will depend on the PDA you purchase and the operating system that runs it.