WINDDE API front calls

The DDE API is based on the front call technique.

The DDE API is based on the front call technology. All DDE functions are grouped in the WINDDE front-end function module.

Table 1. Windows DDE front-end functions
Function name	Description
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEConnect", [ program, document, encoding ], [result] )`	`DDEConnect` opens a DDE connection.
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEExecute", [ program, document, command, encoding ], [result] )`	`DDEExecute` executes a DDE command.
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEFinish", [ program, document ], [result] )`	`DDEFinish` closes a DDE connection.
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEFinishAll", [], [result] )`	`DDEFinishAll` closes all DDE connections.
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEError", [], [errmsg] )`	`DDEError` returns error information about the last DDE operation.
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEPeek", [ program, container, cells, encoding ], [ result, value ] )`	`DDEPeek` retrieves data from the specified program and document using the DDE channel.
Important: This feature is deprecated, its use is discouraged although not prohibited. `CALL ui.Interface.frontCall("WINDDE","DDEPoke", [ program, container, cells, values, encoding ], [result] )`	`DDEPoke` sends data to the specified program and document using the DDE channel.