Creates a temporary definition of a DEC DATATRIEVE port.
       It has a different syntax than the DECLARE PORT statement.
       The DECLARE PORT command can be used only as top level
       phrase; it only creates the temporary definition without
       readying the port.

       Format

         DECLARE PORT  port-name  [USING]  record-name ;

1  –  Arguments

    port-name

       Is the name of the port being defined.
       It must be a simple name.

    record-name

       Is the name of a DECLARED record, or the full or relative
       dictionary path of the record definition to be associated
       with the port.

    ; (semicolon)

       Ends the port definition.

2  –  Example

       The following example defines a port for transferring records
       between the YACHTS domain and an application program:

       DTR> DECLARE PORT MY_YPORT USING CDD$TOP.DTR$LIB.DEMO.YACHT;
       DTR>