DDE Commands         Dynamic Data Exchange xBase management
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 Defining a new DDE          DEFINE [ DDE | LINK ] <oDde> ;
 connection                     [ SERVICE <cService> ] ;
                                [ TOPIC <cTopic> ] ;
                                [ ITEM <cItem> ] ;
                                [ VALID  <uEnd> ] ;

 Activating the DDE          ACTIVATE [ DDE | LINK ] <oDde>

 Deactivating the DDE        DEACTIVATE [ DDE | LINK ] <oDde>

 Ending the connection       RELEASE [ DDE | LINK ] <oDde>

 <oDde>          A reference to the DDE Object.

 <cService>      The service on which establish the connection.

 <cTopic>        The topic on which establish the connection.

 <cItem>         The item on which establish the connection.

 <uEnd>          An action to execute when the DDE is finished.