Http User Parameter modifier again

Hi all, I am using the http user parameter modifier to login a series of users - nothing new there then I here you all say, but within the same users.xml file I want to create a parameter X with multiple values which all the threads can access as a common pool. The xml has an allthreads section,

HTTP User Parameter Modifier

Hi, I'm Mike Hartley. I am currently looking at jmeter for some performance testing of a web application. I am attempting to use the HTTP User Modifier Parameter with release 1.7.3 to create usernames and passwords to login to a login page. However, I cannot get the subsitiution to functio