@startuml skinparam monochrome true skinparam defaultFontName Arial skinparam classFontSize 10 skinparam sequenceBoxBorderColor #black participant "**Host A**\nCRON Service Gate" as hosta_cron participant "**Host A**\nAdministration Gate" as hosta_adm participant "**SSP Host**\nAdministration Gate" as hostb_adm participant "**SSP Host**\nCRON Application Gate" as hostb_cron 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->hosta_cron: CRON-REQUEST-TIMER-Command [Parameters...] on P₁₀ activate hosta_cron activate hostb_cron hosta_cron-->hostb_cron: eCRON-OK [CTX_ID₀₀₀₁] on P₂₀ deactivate hostb_cron deactivate hosta_cron ... hosta_cron->hostb_cron:CRON-ELAPSED-TIMER-Event note left :Notification at a given date and time ... opt loop hosta_cron->hostb_cron:CRON-ELAPSED-TIMER-Event note left :Notification at a given date and time ... end end ... hostb_cron->hosta_cron: CRON-KILL-TIMER-Command [CTX_ID₀₀₀₁] on P₁₀ activate hosta_cron activate hostb_cron hosta_cron-->hostb_cron: eCRON-OK on P₂₀ deactivate hostb_cron deactivate hosta_cron @enduml