@startuml skinparam monochrome true skinparam defaultFontName Arial skinparam classFontSize 10 skinparam sequenceBoxBorderColor #black participant "**Host A**\nCRON Control Service Gate" as hosta_cron_ctr participant "**Host A**\nAdministration Gate" as hosta_adm participant "**Host B**\nAdministration Gate" as hostb_adm participant "**Host B**\nCRON Control Application Gate" as hostb_cron_ctr autonumber ...**Notation:** Gate Identifier : Pipe Session Open on [P_IN,P_OUT]... hostb_adm->hosta_adm:EVT_ADM_BIND [**CRON_CTR,P₂₀**] hosta_adm->hostb_adm:EVT_ADM_BIND [**CRON_CTR,P₁₀**] note right : Pipe Session Open on [P₂₀,P₁₀] note left : Pipe Session Open on [P₁₀,P₂₀] ... hostb_cron_ctr->hosta_cron_ctr: CRON-REQUEST-TIMER-Command [Parameters...] on P₁₀ activate hosta_cron_ctr activate hostb_cron_ctr hosta_cron_ctr-->hostb_cron_ctr: eCRON-OK [CTX_ID₀₀₀₁]on P₂₀ deactivate hostb_cron_ctr deactivate hosta_cron_ctr ... ... hostb_cron_ctr->hosta_cron_ctr: CRON-KILL-TIMER-Command [CTX_ID₀₀₀₁] on P₁₀ activate hosta_cron_ctr activate hostb_cron_ctr hosta_cron_ctr-->hostb_cron_ctr: eCRON-OK on P₂₀ deactivate hostb_cron_ctr deactivate hosta_cron_ctr @enduml