Joe, what is split screen?

Joe,  not to be dense, but what exactly is the split screen feature and
how and where do we use it?
 
thanks!
 
Tim Swartz 
The Farmington Company 
This message (and any associated files) is intended only for the 
use of the individual or entity to which it is addressed and may 
contain information that is confidential, subject to copyright or
constitutes a trade secret. If you are not the intended recipient 
you are hereby notified that any dissemination, copying or 
distribution of this message, or files associated with this message, 
is strictly prohibited. If you have received this message in error, 
please notify us immediately by replying to the message and deleting 
it from your computer. Messages sent to and from us may be monitored. 
 
Internet communications cannot be guaranteed to be secure or error-free 
as information could be intercepted, corrupted, lost, destroyed, arrive 
late or incomplete, or contain viruses. Therefore, we do not accept 
responsibility for any errors or omissions that are present in this 
message, or any attachment, that have arisen as a result of e-mail 
transmission. If verification is required, please request a hard-copy 
version. Any views or opinions presented are solely those of the author 
and do not necessarily represent those of the company.