If you’re coming from Windows, you are probably familiar with the Windows Task Manager. Well, Linux has the same type of tool, called the System Monitor.
Menu > System Tools > System Monitor is where you will find it in most distributions. Though it’s a tool so useful, you may want to add it to your panel!
The first tab, System, will show you a quick overview of your installation. Processes will show you what is currently running. Resources will show you how your CPU, memory and Network are running. File System will show you your mounted volumes
Have a program that is hanging? Then open the system Monitor, highlight the offending application and select End Process. While Linux tends to be quite stable, it is possible sometimes to have a program act up.