I am using Jmeter 1.8 and and want to paremtize my test for existing users on my apps database. I have an http post which log ins at the begining of my thread goup. I have one thread group on which I want to set several users/threads that will loop say 10 or 15 times. I wanted for each loop that user1 - user10 will be utilitzed so two concurrent jmeter users will not utilize the same user from my applciations database. I could not figure out how to do it. I tried to create a list with config element "User Paremters" but could not figure out how to get the loop in the thread group to use this as set of vars. Anybody have a suggestion.