Registrar duties in appeal administration: oversee reception, scrutiny, amendment, scheduling, records and service procedures. Registrar's functions under Rule 26 cover administrative management of appeals: receiving appeals and documents; deciding scrutiny questions before registration; directing formal amendments and requiring compliance with rules; fixing hearing dates and issuing notices subject to the Presiding Officer's directions; ordering copies and permitting inspection of records; requisitioning records from courts or authorities; and disposing of service-related applications, including substituted service by advertisement.