https://pubs.opengroup.org/onlinepubs/9629399/chap6.htm#tagtcjh_10 https://pubs.opengroup.org/onlinepubs/9629399/chap6.htm#tagt... > With the RPC communication

https://pubs.opengroup.org/onlinepubs/9629399/chap6.htm#tagtcjh_10 https://pubs.opengroup.org/onlinepubs/9629399/chap6.htm#tagt... > With the RPC communications protocols, a maybe call lacks execution guarantees; an idempotent call, including broadcast, guarantees that the data for an RPC is received and processed zero or more times; and an at-most-once call guarantees that the call data is received and processed at most one time (may be executed partially or zero times). Both idempotent and at-most-once services guarantee that a sequence of calls in a session are processed in the order of invocation by the client.