Email interactive pdf from webdynpro without displaying form

Question

Hi all,
We have a webdynpro application that needs to generate an interactive form and send it by email, without first displaying it to the user.  I have built the interactive form in a webdynpro component and it works fine, but I think it requires the window to be opened to generate the pdf xstring to be attached to the email.  But we do not need the window to be opened because the users don't want to review the form before sending it. (whether this is a good idea or not is not up for discussion. )
I am wondering if there is a better way to accomplish this? More detail on scenario: the user selects some data in the screen and then clicks a button like "send form". They fill out a popup with recipient info and then click "send".  A form based on the data they originally selected should be sent to the recipient. The recipient (who does not have access to SAP) fills out some fields in the form (hence it needs to be interactive), then sends the completed form back to the originator via email.
Thanks for any suggestions!
Margaret

Answer 1

Thanks to all for your responses. I could have stated the problem more succinctly as: how to send a form with ZCI layout (not standard layout) via email? 
The pointers you gave are helpful and probably would have gotten us to the solution. We found we could use the normal functions, "CALL FUNCTION 'FP_FUNCTION_MODULE_NAME' ...." and then
CALL FUNCTION funcname
  EXPORTING
    /1bcdwb/docparams  = fp_docparams
      /1bcdwb/docxml     = docxml
where docxml is the output of a custom transformation we built to convert a deep ABAP structure to the correct XML format. (Note that "CALL TRANSFORMATION id ..." does not work correctly for converting deep structures for ABAP forms because the id transformation inserts <item> where <DATA> is needed.)