这种 group 管理功能不错 :)

Ivn

实现窗口的 group 管理，显示器比较小的时候非常方便 ~~

// -- pekwmdocs.txt
5.1. What is window grouping?

Window grouping is a very simple concept, but it's very hard to understand
at first. It's a simple way of making multiple applications share the exact
same space.

The simplest way to explain this is with an analogy. Imagine you have 20
sheets of paper. To save space, you stack them on top of eachother. then,
you have little tabs sticking out of one edge so you can quickly flip to
that sheet of paper.

In pekwm, Window grouping is visually done by dividing up the physical space
on the titlebar, while most other window managers that implement this
functionality prefer to use a "Tabs that Stick Out of the window border"
look and feel. The pekwm team feels that this is a waste of screen real
estate, as non-rectangular window frames are harder to fit against
eachother.

这是 pekwm 的 ，
fluxbox 也有同样的功能 ...