For sessions with parallel-session-capable partners, the SNASVCMG mode name sessions are the last to be deactivated. Application programs should wait until the SNASVCMG sessions with all partners of the local LU are deactivated before closing the ACB. To help the application program determine the current number of active sessions assigned to the partner LU, VTAM® returns the RPL6LAST field in the RPL extension when the ATTN(LOSS) exit is scheduled.