File downloading?

Hi, Is it possible to send a file to a browser? I would like to allow people to download a file, but I don't want to give away the path to the file, so a normal link wouldn't work. I am hoping there is a way to use php to send the file using code, rather than trying to first copy the file to a temp dir then give them the link, then worry about deleting the temp dir again. ( I am not sure if my first email went through, I got an error back about the mailbox being full) Thanks, Chris