About DDE.APP_BEGIN

[hemaltoknow]

i write the code about this

CREATE OR REPLACE PROCEDURE Proc_Document IS
AppID PLS_INTEGER;

BEGIN

-- AppID := DDE.App_Begin(' C:\Program Files\Microsoft Office\Office\W INWORD.EXE',DDE .APP_MODE_MINIM IZED);

AppID := DDE.APP_BEGIN(' E:MSOFFICEexcel excel.EXE',DDE. APP_MODE_MINIMI ZED) ;


END;
/

and i got the error about PLS-00201: identifier 'DDE.APP_BEGIN' must be declared

what i can do
please give me solution . i am very confuse