new console/ thread in swi prolog

Im creating the expert system for a medical centre, its my final year projec
t. 
Its going well, and i wonder if you could help me with some very quickly. 

I need my prolog window, to open a new thread, this is done with the command
 interactor/0  , but this just opens a blank thread, what i need it to do is
 load the new thread and run a pro. code. bascially one thread calls another
 one which in turn starts and and runs another program, so the second thread
 will need to do any commant such as " write('this is your second window fro
m which you can use prolog')"

is there such a method? 
 
thank you very much for your help, 

(im using swi prolog)