To change the default setting for Xwindows you can put your settings in a file ~/.Xdefaults ( ~ being your home directory i.e. /etport/home/user)
Meny diffrent Xwindow setting's and appplication can be cutomised from this file, some example of which are below.
After you have saved your settings you need to ether logon/off the Xwindowing system or you can use a xrdb merge command such as:
`xrdb -merge ~/.Xdefaults`
from command line, which will merge in the changes you have made.
Dtterm*term.background: #000000 Dtterm*term.foreground: green Dtterm*saveLines: 10000