3.16.4 Message Processing Events and Sequencing Rules
On receipt of an ORPC ([MS-DCOM] section 3.1.1.5.4), the Security ORPC Extension (section 2.2.3.2.4) MUST:
Add an entry to the Security ORPC Extension table, and MUST set the fields in the entry to the corresponding fields in the Security ORPC Extension structure contained in the ORPC message.
When returning from an ORPC ([MS-DCOM] section 3.1.1.5.4), the Security ORPC Extension MUST remove the entry corresponding to the ORPC from the Security ORPC Extension table.