example or tutorial on open-edit-save word file

Hello,
 
I am new to Slide and want to create a portlet/webside (in J2EE ) that displays a Word icon( a link), the idea is that students click on it, then at the cleint side Word opens with their personal doc-file. Then they alther it, they click on save (which saves it to the server side). I looked on the jakarta site and wiki and googled it, but I find little usefull info.

Has anyone a good example or tutorial on how to realyze this?

Regards,

Erik