TEmp File

Here is the scenario: I want to let my users download their history of transactions from a mysql database. I have that part working...they click a link a csv file is created for them to download. now here is my question. Is there a way to have the file delete after they have downloaded it? Also is there a way to have the file download as filename.csv but have the actually file that is create named a random name of numbers and letters i.e. 2s3d4f5g6h.csv My concern is to have the file be deleted after download and/or make it so no other users could guess the url and download someone else's history. Any Advice is much appreciated. thanks randy