In the
Client/Server groups window the names of groups are displayed that can be edited by the buttons on the right. By the
New or
Edit button the
Socket client group/
Socket server group window is opened where it can be defined a new or to edit the selected group. By the
Delete button it is possible to remove the selected group.
It is possible to communicate within more PROMOTIC applications on one or more computers. But it is necessary to have only one application that contains server groups started on one computer. If more server applications have to be started on one computer, then each of these applications must use different
system port number. The number of applications containing only client groups on one computer is theoretically unlimited. The total number of all socket groups should practically be in tens at the most.
Each group communicates on its own port. If the group has not defined this port explicitly by the designer, then this port can be get by the system socket - see "
System port" configurator. It means that the group sends a request for the port number of the group to the server by means of the system socket. The server responds with the assigned number to the group and then the group communicates only to the port with this assigned number.