PmData(Web)Client - licence for PROMOTIC clients for Internet/Intranet/LAN

PROMOTIC uses the client - server model for communication in LAN and the Internet/Intranet.
- The server application provides its data.
- The client application on the contrary reads/changes the data from/on the server.
The PROMOTIC client can be:
1. PROMOTIC application that reads/writes the data from/to the application of the Server type. The client PROMOTIC application can exchange data with the server by using the XML standard (or over the PROMOTIC "socket" interface, that is now considered obsolete).
2. WEB client that views the data in the form of HTML pages (data or panels) from the PROMOTIC WEB server. For viewing HTML pages, for example, the MS Internet Explorer can be used. These clients can visualize (or change) the data from the PROMOTIC Web server but not all is allowed to them that is allowed to the client application created and operated under the PROMOTIC system: for example, communication with PLC's, creating user algorithms, etc.
3. Another application that reads/writes the XML data.
From business point of view we distinguish two types of clients - "runtime" licenses:
1. PmDataClient. This license enables to:
- Receive and send data by the XML standard (or the old fashion way by Sockets). These are the following data transfers:
- Communication between objects PmData or PmDataTable.
- Read XML data from PmAlarmEvent object.
- Read XML data from PmTrend object.
- Use objects PmWebDir (for offering HTML pages from disk file) and PmWebInfo (for remote viewing the INFO system).
2. PmWebClient. This license enables everything like the "PmDataClient" and moreover it enables to view and get data from subsystems:
- On-line viewing application panels as automatically generated dynamic html page, so called Web Panels.
- Alarms and Events: viewing alarms and events on WEB clients (in the Internet Explorer).
- Trends: viewing trends in the graph and table form.
Both clients licenses enable to operate the client regardless of whether it is a PROMOTIC application or not. Licenses for clients are stored (need to be purchased) to the PROMOTIC WEB server. Then the server enables to communicate with as many clients as how many licenses it has got. The license is so called "flying": Web clients can be started from various PC stations but the number of concurrently running clients must not exceed the number for which the runtime license has been purchased. If, for example, the PROMOTIC WEB server has got only one client license, then only the first client that applies for the data, is connected. If this client doesn't apply for new data after 10 minutes, it is unregistered from the server and a new client can connect.

But if the client application runs on the same computer as the server one and if the server address is set on the client as "http://localhost/" or "http:/" (this means the general-purpose address for the local computer), then this client connects to the server always as the PmWebClient without no need to have a license (i.e. local client is free of charge).

- The Development key contains 5 available clients of PmWebClient type for testing purposes.
- In the PmFree type application, there are 2 available clients of the PmWebClient type.
Maximum and current count of connected clients can be found in runtime by the Pm.LicenceInfo property.
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