This assumes an SGI box:

Method 1:

• press F2 in O to get a teeny-weeny black window
• move it a bit to the side so it's half hidden behind your O window
• move the cursor into the black window and press ALT/F10
• press F8 in O to get rid of the menu and prompt area
• MOVE YOUR CURSOR OUT OF THE O WINDOW
• take a picture
• press ALT/F9 in the black window to stow it as an icon

Method 2:

• you need the following line in your .cshrc : alias mkslide "scrsave a.rgb 320 1269 11 993; slide a.rgb; rm -i a.rgb" warning: if you have a file called a.rgb, it will be overwritten!
• run O, use F8 key to get rid of menus and stuff
• MOVE YOUR CURSOR OUT OF THE O WINDOW
• in another window, enter 'mkslide' at the shell prompt
• take a picture
• press the ESC button to get back

Note that you may have to change the numbers in the alias in order to save exactly the portion of your screen that contains your O window. Also, this method is much slower than method 1.