Want to link with the cash register...

Hi,
this is ram again. I have a requirement to link the electronic cash register with frontaccounting. basically its a cash register from toshiba and it has one vb based pos software too. at the end of the day the two cash registers data will be pulled into this software. this vb software works with access database. i identified the table. now i want to import them to front accounting as sales with invoice transactions and at the same time i want to export products list and their prices to access database. can anyone suggest me what are the tables i need to update or how to go for it.

Thanks & Regards,
Ram