Where a particular regulation calls for their application, the rules in this subpart B of part 4000 tell you what methods you may use to issue a notice or otherwise provide information to any person other than us (e.g., a participant or beneficiary). They do not cover payments to third parties. In some cases, the PBGC regulations tell you to comply with requirements that are found somewhere other than in the PBGC's own regulations (e.g., requirements under the Internal Revenue Code). If so, you must comply with any applicable issuance rules under those other requirements. (Subpart A tells you what filing methods you may use for filings with us. Subpart C tells you how we determine your filing or issuance date. Subpart D tells you how to compute various periods of time. Subpart E tells you how to maintain required records in electronic form.)