# 3.2. The Process Tree Page

The Process Tree Page has been designed to show the relationships between the running processes. A process that is started by another process is called the child of that process. A tree is an elegant way to show this parent-child relationship. The init process is the ancester of all processes.

If you are not interested in the children of a particular process you can click on the little box to the left of the parent and the subtree will collapse. Another click on that box will unfold the subtree again.

This page features four buttons to modifiy the tree. The buttons are described from left to right.

## 3.2.1. The Sort Button

This button determines the sorting order of the children in the tree.

## 3.2.2. The Refresh Now Button

The Refresh Now Button must be used to update the tree with the current processes.

## 3.2.3. The Change Root Button

If you are only interested in a certain subtree you can selected the parent of the subtree and push this button to make the selected process the new root of the tree. Pressing this button when no process is selected will restore the initial setting.

## 3.2.4. The Kill Button

If you want to terminate a process you can send a kill signal to the selected process by pressing this button.