Before the closing date and time specified, an employee or agent of the MAC Contractor with authority to bind the company goes to the Vendor Portal and logs in using a registered user name and password. He or she then prepares their bid by adding their proposal documents as attachments and completing the pricing form with a grand total of all line items included in the solicitation. Once the bid is prepared & submitted, it is considered a legally binding offer that has been electronically signed by the MAC contractor. This action triggers a time date stamp and both the action and the time it was accomplished is recorded in the Vendor Portal log file.