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Important Notice!

Dear SDI Customers,

We regret to inform you that as of 9/26/2025, SDI USA has ceased all operations. Due to the lack of sufficient management structure and an aging workforce, we are no longer able to meet the high standard of support and service our customers deserve. As such, we have made the difficult decision to terminate our company's operation.

Licensed customers are authorized to continue using their licensed software products without further License or Maintenance and Technical Support fees. However, no Technical Support services will be available. The software products affected by this change include TN3270 Plus, SDI LPD, and any other software licensed by SDI USA in the past. There will be no future product updates, no new releases, and no new licenses. The products should continue to perform their intended function until changes to the operating environment make it incompatible with our products. Feel free to continue using the products for no cost until you decide to move to another supplier.

We intend to keep the sdisw.com website available, but unmonitored until 12/31/2026. We recommend that you download the installation files, user guides and sample files and keep them in a safe place for your future use before the web site closes down.

We have witnessed monumental changes in the computer software industry during the past fifty plus years and have enjoyed working with so many outstanding companies and wonderful people over those years. We wish you all a prosperous future.

SDI USA

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Dynamic Data Exchange (DDE)

Overview

Dynamic Data Exchange (DDE) was a precursor to Microsoft's OLE automation. DDE allows Windows applications to exchange data with one another. TN3270 Plus DDE support allows you to write applications that send commands to, and receive data from TN3270 Plus. Your application becomes the terminal emulation operator.  

A sample DDE program can be found on our customer downloads page.

Using DDE and TN3270 Plus Scripting

It is also possible to use the DDE commands available in the TN3270 Plus scripting language to send data to DDE enabled applications. For example, we have a user that wrote a TN3270 Plus script that creates a monthly sales summary in a Microsoft Excel spreadsheet. The TN3270 Plus script opens Microsoft Excel, uses DDE to create a spreadsheet, uses screen scraping to gather information from the mainframe computer and then uses DDE to move the data into the Microsoft Excel spreadsheet. The result is spreadsheet with a summary of monthly sales. A tedious, time consuming, error-prone data entry task is automated into a single TN3270 Plus script.

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