A sidelite is a glass panel set on one or both sides of a window. A highlite is a glass panel above a window. A lowlite is a glass panel below a window. You can choose which lites which you want to display.
To display lites on a window:
Select the window.
Right-click and select Properties, or select Edit > Modify Elements > Properties.
In the Windows dialog, select the Basic tab.
To display a highlite over the window, enable the Display Highlite check box.
To display a lowlite under the window, enable the Display Lowlite check box.
To display a sidelite on the left side of the window, enable the Display Left Sidelite check box.
To display a sidelite on the right side of the window, enable the Display Right Sidelite check box.
Click OK.