+@cindex WEIGHT
+@item WEIGHT
+When a subnet becomes (un)reachable, this is set to the subnet weight.
+
+@cindex INVITATION_FILE
+@item INVITATION_FILE
+When the @file{invitation-created} script is called,
+this is set to the file where the invitation details will be stored.
+
+@cindex INVITATION_URL
+@item INVITATION_URL
+When the @file{invitation-created} script is called,
+this is set to the invitation URL that has been created.