ok, not sure what you mean by loaded to 100% or loaded to 88%. but I can help with the rest of the question.
The request system is set up so when you click "request now", it will go into the queue to be played. you can view what's coming up in the queue at the following page:
http://www.subsonicradio.com/station/now_playing.php
Your requests aren't saved anywhere to listen to later. Think of it kind of like a jukebox - when you put the money in and request the song, it will play almost immediately (also, once you request you can't cancel it). Your requests will be put into the queue after any other requests from other users.
To listen to your requests, just tune into one the Requests streams (128k, 64k, or 24k) from the main page.
any other questions, feel free to ask, or just check out the
FAQ from the main page
"And please do not sit on the floor. My studies show you can't experience time travel on the floor. and it's not a pretty picture in those shorts" - The Timekeeper
Site Admin, WDW Freak