The Background Image Properties dialog is invoked by selecting Background Image Properties from the View menu, or by clicking the Background Image Properties icon    on the toolbar.

Show Picture

This check box will enable/disable the background picture.

Up (Previous Picture)

This button will show the attributes of the previous background picture.

Down (Next Picture)

This button will show the attributes of the next background picture.

Real World Extents

The outer corners (Top, Left, Bottom and Right) where the PICT file will be imported. If importing an HPGL format file, then the rectangle corresponds to the edges of your drawing in the drawing package. These coordinates determine the aspect ratio and scale of the imported background.
XP uses double precision coordinates with up to 20 significant figures. This enables map coordinates to be retained. Once a picture has been imported it is treated in the same manner as any other element of the network.