Jmeter for load testing and stress testing

Hello
I have few few question on Jmeter for load testing and stress testing,Can any one give me brief introduction how can i use
beanshell with Jmeter.

I wants to store String length to the global variablein my application. Do u know how it is possible?

HI dhamodharan2006,
I dont know anything about Jmeter, but here is a url [url=http://jakarta.apache.org/jmeter/usermanual/functions.html]JMeter - User's Manual: Functions and Variables[/url]

Now storing a global is easy enough. At vuser_init() setup your globals.

long file;
char *filename = "c:\\webtours_Log.txt";

vuser_init()
{