IPG Active Registered Vendor Disclosure (formerly named FORMS B). Complete this section if you are using an active State of Illinois Vendor Registration Number. Bids will be accepted from only those companies that request and receive written Authorization to Bid from IDOT's Central.A pretty standard place to start is to request, in the RFP, a copy of the company's W-9 form and a current certificate of insurance. A Request for Proposal (RFP) is the appropriate competitive selection process for purchasing goods or services when price is not the most important criteria. A brief description of the proposed procurement must be included in the notice. Forms – All proposals must be submitted on the forms provided, complete with all blank spaces filled in and properly signed in ink in the proper spaces.