sometimes GUI will not always good, if what we need is performance.
while still on shell mode, and need to register some variable to windows, use following command :
SET : will only impacting our current shell, temporary, will be lost while closing the window, and will not impacting our future shell window.
SETX : will impacting our current shell and future shell window.
COMMAND : SETX PATH “%PATH%C:\Ruby22\bin”