You can repeat this as often as you want. Every time you split a window, one new window is created. Therefore, the call that does this is called glk_window_open().
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<note><para>
-It might have been less confusing to call it <quote>glk_split_window()</quote> — or it might have been more confusing. I picked one.
+It might have been less confusing to call it <quote>glk_split_window()</quote> — or it might have been more confusing. I picked one.
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It is important to remember that the order of splitting matters. If you split twice, you don't have a trio of windows; you have a pair with another pair on one side. Mathematically, the window structure is a binary tree.