You could try the following code, but I don't know exactly what'll happen:
tmpSubject:= Subject;
@Command( [MailForward] );
@Command([EditGotoField] ; "Subject");
@Command([EditInsertText] ; "Forwarding: " + tmpSubject);
@Command([EditGotoField] ; "Body")
What was the code you tried?
There's one obscure function that you might need, but I have to look it up, it's well hidden in the Help db... Ah, gotcha!
@UpdateFormulaContext
Maybe the code should be like this:
tmpSubject:= Subject;
@Command( [MailForward] );
@UpdateFormulaContext;
@Command([EditGotoField] ; "Subject");
@Command([EditInsertText] ; "Forwarding: " + tmpSubject);
@Command([EditGotoField] ; "Body")