Tablet/PDA enabled Inventory System

Question

Hi All,
I want to design, develop and implement an inventory system for a LAN environment. The inventory system should be able to update itself through tablet or pda or smart phones. What is the best practice for this and what technology should be used to serve this purpose. The application is supposed to be a Windows platform application with a server and a database but should be accessible through a mobile device also for privileged use and update.

Please advise.
Thanks
Tom