Data Capture from the web

Hi all, I have some challenges when it comes to V4. My customer wants to capture the data from the web interface and save the data/records into Navision database… Can someone please advice how this can be possibly done when the user portal is not made available in V4… On the other hand, my customer also wants to capture the data from pocket PC/PDA and send the info back to Navision… Any suggestions are appreciated. Thanks.