I very much doubt it was used in this case, but https://www.websequencediagrams.com/ https://www.websequencediagrams.com/ is great if you want to do Message Seq

I very much doubt it was used in this case, but https://www.websequencediagrams.com/ https://www.websequencediagrams.com/ is great if you want to do Message Sequence Charts.