AutoDiscovery.SendMessageToGroup
From Xojo Documentation
Method
AutoDiscovery.SendMessageToGroup(command As Int32, data As String)
Supported for all project types and targets.
Supported for all project types and targets.
Sends the message consisting of command and data to the group.
Notes
Effective with 2017r3, the command parameter is Int32 instead of Integer to prevent incorrect behavior in 64-bit apps.
In order for this method to work you must have first registered a group (using the Register method).