Is it possible to enable a web user to browse his/her computer, find, and upload a file (to a global or container field?) while in an IWP page? I.E.- the user fills out a form, uploads a resume and clicks Submit. I know container fields are funny for IWP users. Any suggestions?

Container fields can only be viewed in IWP, their contents cannot be added/edited/deleted via cut/paste. This limitataion is because IWP tells the browser how to display the web page using HTML and containers are transferred to the browser as static graphics.

Look into the FX php package, I've successfully used that to add an upload feature to IWP. The code I wrote was proprietary to my last employer, so I don't have it to give you as an example...