External txt problems

first off i want to know how i can make flash write to an external txt file without using php like i am atm…

and secondly when i get my php to write to an external i have for example:
user=person6&input=how r u?
user=person1&input=nice weather

if u havent yet gathered im trying to make a lil chat room, its onli for about 3 people so i dont need to much, that reads and writes all the info to a txt file…
how would i gte flash to load the file and not just the top line?