AutoDiscovery.UpdateMemberList
From Xojo Documentation
Method
Clears the internal list of connected members and queries the network for all members of the current group.
Sample Code
This code registers as a group member and updates the list. Everyone on the network who wants to join the group needs to use the same group name:
AutoDiscovery1.Register("MyGroup")
AutoDiscovery1.UpdateMemberList
AutoDiscovery1.UpdateMemberList