NETWORK PROGRAMMING

I WANT TO MAKE ONE ACCOUNTING AND INVENTORY PROGRAMM WHICH SHOULD BE ABLE TO RUN ON NETWORK AND ALL THE DATAENTRIES SHOULD BE KEPT ON ONLY ONE COMPUTER WHICH IS ADMINISTRATOR AND THE OTHER COMPUTERS ON THE NETWORK ARE THE CLIENTS AND THEY SHOULD HAVE LIMITED ACCESS OF THE SOFTWARE. FOR THIS WHAT I SHOLD NEED AND WHICH PROGRAMMING LANGUAGE AND DATABASE I SHOULD USE WHICH IS SAFE FOR EVER?