The snap shot of command code MFREQ. MFREQ is used to establish an entity or tax module when a control base is not required. MFREQ requires a definer and generates a TC 902. If the name control is not known, substitute AAAA for valid accounts and WXYZ for invalid accounts. Definer D brings a tax module and its related entity data from the Master File to IDRS for approximately two weeks after the request. Definer C brings the account from CFOL to the local IDRS while the user is waiting. If the MFREQ request is accepted, the input screen is redisplayed with the message, REQUEST COMPLETED. To access a valid SSN, input the following: MFREQC000-00-4321 (new line) 30 200612 RUST.