new to selenium-webdriver, switching from one window to another -

currently have started use selenium 2.0/web-driver automation testing company work for.

currently have 20 tests developed testing, when run tests open new browser window each test.

unfortunately though need new user registration/login info executed in first test used in rest of tests since i'm testing webstore/shopping cart.

my question is, there way either stop having new browser windows opening or close window , place focus first window new user registered , logged in? through doing research before writing question here found out

driver.getwindowhandles();

which have being run in registration test case ,

driver.switchto().window("handle");
have being run in second test case , thought should have put focus first window.
i'm using driver.close(); close additional windows being created, prefer don't open in first place.

if understand question correct need - add procedure @before annotation , inside procedure open driver. add procedure @after annotation , close driver. inside tests (with @test annotation) need use driver.get. in case new windows not opened.