How to work with multiple windows in Selenium

How to work with multiple windows in Selenium String s2[] =selenium.getAllWindowNames(); selenium.selectWindow(s2[1]); //perform the actions selenium.selectWindow("");//goes to the parent window //do some actions

String s2[] =selenium.getAllWindowNames();
 selenium.selectWindow(s2[1]);
 //perform the actions
 selenium.selectWindow("");//goes to the parent window
 //do some actions