root:

~

commands:

here:       echo "Hello, here."
there:      echo "Hello, there."
world:      echo "Hello, world."
me:         echo "Hello, me."
you:        echo "Hello, you."

windows:

-
  name: windowA
  layout:
    - [ here, there ]

-
  name: windowB
  layout:
    - [ here, there ]       # row 1, with 2 panes
    - [ world ]             # row 2, with 1 pane
    - [ me, you ]           # row 3, with 2 panes

-
  name: windowC
  layout:
    - [here, me, you]
    - [here, me, you]