how can i run a report from the form by parameter and each time the parameter has a new value and

yield a new report result
each result was in a separated file .

how can i specify that the output in a separated file and open this file at the same time

i have a report that query the data from emp table (select ename from emp where deptno = :dept_id) :dept_id is the parameter

i make a form on the dept table

and make a button to call the report with the selected department (by passing the deptno from the form)

i want that for each time i run the report , a new file generated in the folder and open it at the same time

(the default when i run the report , the file replaced with the new file, and i don't want that)

quickly please

thank you

if :PROJECT_NAME is null then
message('you must select CONTRACT number to show report');
message('you must select CONTRACT number to show report');
else
declare
  pl paramlist;
 begin PL:=create_parameter_List('Par_cont');
   Add_Parameter(PL, 'MAXIMIZE', TEXT_PARAMETER, 'YES');
   add_parameter(PL,'Par_cont',text_parameter,:CON_NUMBER);
   add_parameter(PL,'PARAMFORM',text_parameter,'no');
   Run_product(Reports,'CONTRACTs2.rep',asynchronous,RunTime,FileSystem,pl);
   Destroy_Parameter_List(PL);  
 end;

end if;

'CONTRACTs2.rep' = report name
'Par_cont' = Prameter name
:CON_NUMBER = Prameter  sours