Windows XP command prompt is a quick place to use simple commandtools, such as ping utility. You can change the default command prompt property by right click on the window bar and select property. Change its property as you fit and apply change.
If you want to keep the property for future command prompt windows, select Save properties for future windows with same title option.
It is hard to go back to window size command prompt from full screen size if you do not know the keyboard short cut. The cut to toggle the command prompt from window size to full screen is ATL-Enter.