To run Xcas in a graphical environment, it depends on which operating system you are using.
xcas &If for some reason Xcas becomes unresponsive, you can open a terminal and type
killall xcasThat will kill any running Xcas processes. When you restart Xcas, you will be asked if you want to resume where you left off using an automatic backup file.
When you start Xcas, a window will pop up with menu entries across the top, a bar indicating information about the current Xcas configuration, and an entry line you can use to enter commands. This interface will be described in more detail later, and you can get help from within Xcas with the menu item