This is a utility intended for people who know how the system path works and are comfortable modifying it.
It works by modifying the System Path Environment Variable stored in your Registry. It keeps a detailed log of all changes made, so should you need to restore an old System Path, you only need to examine the log file to retrieve it. The log file stores every change and if anything goes wrong the log file will contain all past values of the path which you can use to restore your system (or local) path to any previous value easily.
The registry locations of the paths are:
Local = My Computer\HKEY_CURRENT_USER\Environment\PATH
System = My Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment\PATH
NOTE: Disabled items are stored in the .ini file, so do not delete this file or the disabled items will be lost.
(as of version 1.28 the program also keeps a backup ini file in windows\system directory in case you foolishly delete yours by accident).