How to split byobu screen?

The controls have changed since the accepted answer was posted. From Byobu's help page:

• Split screen horizontally:

  • Shift+F2 or
  • Ctrl+A then |

• Split screen vertically:

  • Ctrl+F2 or
  • Ctrl+A then %

• Switch focus:

  • Shift+↑ ↓ ← → or
  • Ctrl+A then ↑ ↓ ← →

1 . Can somebody explain to me what programs are used here?

• Program top left is the command htop (is similar to command top)
• Program top right is indeed a terminal and the bottom one is indeed vim

2 . And how to make such a byobu screen?

• Horizontal split: Ctrl+A S
• Vertical split: Ctrl+A | (there is a vertical screen patch that switches the shortcut to Ctrl+A V)
• To move the focus to the next split: Ctrl+A Tab

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Some more shortcuts.