title: asp: open "save-as" dialog for PDF (using asppdf + xmlhttp)
body: <p>i'm using asp + asppdf (a component for creating pdf files). 
  asppdf has a method called SaveHTTP which causes the browser to open the "save-as" dialog for saving the pdf. so the component is sending the pdf as binary data to the browser.</p>
  
  <p>my question: i'd like to load the pdf via xmlhttp + then open that dialog.
  loading works (i'm getting the data) - but i'm not sure how to call the save-as dialog.</p>
  
  <p>any ideas if it's possible?</p>
  
  <p>thanks</p>