Is there a simple way to determine if an installed OES runs OES or OES

The download pages for OES are confusing. The pages and the
installation instructions talk about files that have names like
oes-linux-sp1-1.iso and oes-linux-sp1-2.iso, but there are no such
files to download, only oes-linux-1.iso etc.

I'd like to verify that I actually have OESSP1.

Erik Forsberg Telephone: +46-13-21 46 00
Cendio AB Web: http://www.cendio.com