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Process 
ID
 (
PID
). We discussed PIDs in 
Chapter 7
, 
Controlling and Managing Processes
. To 
scroll through the list of processes, you can press 
Page Up
 or 
Page Down
 or use your 
arrow keys. In addition, 
htop
 features mouse support, so you are also able to click on 
columns at the top in order to sort the list of processes by that criteria. For example, 
if you click on 
MEM%
 or 
CPU%
, the process list will be sorted by memory or CPU usage 
respectively. The contents of the display will be updated every 2 seconds.
The 
htop
 utility is also customizable. If you prefer a different color scheme, for 
example, you can press 
F2
 to enter