1. A Proposer - let's call him Peter - wants XOs for his grassroots group / cool project / pilot. He writes up a description of what he'd like to do, who he'll be working with, his experience, how they'll carry out the plan - basically, a project proposal - and sends to a closed mailing list of Choosers and Amenders. Peter's proposal is not posted publicly.
2. The Choosers and Amenders (who are the same people) look at Peter's proposal. If they don't think it creates enough value to OLPC to warrant what he's asking, they send him back feedback on the same, or a "sorry, we can't do this" letter.
3. If the Choosers and Amenders /do/ like Peter's proposal, they tell Shipping (Julia) to mail laptops to Peter straight out of 1cc, and the process closes.
4. Alternatively, if the Choosers and Amenders become aware that someone needs an XO, they can decide to ask Julia to send her a donated laptop even without a proposal being submitted.