The handheld computer usually collects data in a SQL CE or another type of database storeage using its built in barcode scanner and the Windows Moble or CE based operating system. It may soon be a bigger market for Apple using the Iphone and others with scanners attached.
Batch is really the simpler of the 2 since it requires no wireless connectivity. It is simple using by coupling it back to the pc where it syncs with a program to update your database. It also can pass data down to your Handheld Computer to be used out in the field or factory. The military and federal government usually will use batch processing due to the risk of using wireless and being more open to the outside world. Typically it is a much cheaper technology to implement.
Wirelesss or Realtime processing is done using WIFI or Cellular type connectivity to a host. The host PC or server is also connected in a way that it can communicate with the handheld computer to allow it to update and be updated. This is optimal for most manufacturing and field service activities.
Many products are available that utilize both technologies. Realtime or Batch processing can be equally effective given the situation. Realtime is preferred when adequate wireless coverage is available and where a wireless signal is not prohibited from use.
