External Bots are bots that were not built in AtBot but support the Direct Line channel. These bots can be registered as an External Bot and then used as agents in a Concierge Bot.
The following are the operations you can use in Flow to affect bot memory
//C# Sample - Bot Framework //Create an activity designed to send back to the user Activity eventToSend = context.Activity.CreateReply(); //Change it to a type event eventToSend.Type = ActivityTypes.Event; //Set the name of the event to ChatEventReceive eventToSend.Name = "ChatEventReceive"; //Set the value to a JObject with a property named EndSkill = true eventToSend.Value = JObject.Parse("{ EndSkill : true }"); //Send the event await context.SendActivityAsync(eventToSend);