You may see this designation on your pass number of Cimatron E8. Or on the patches that you can download for E8.
It simply stands for "old computer". Cimatron E version 8 was compiled to take advantage of functionality that only
certain newer processors can support. This functionality is referred to as SSE2, and it allows newer processors
to process certain functions much faster. If the E8 DVD senses that your PC has a processor that does not support
this functionality, it installed the "OC" version of Cimatron E8, which was compiled in a way that does not require
the SSE2 functionality. There was no user interaction required to make the decision, the install figured it out for you.
However if you are now going to manaully install a patch, you need to know whether you are using the "OC" or regular version of E8.
The OC version should use the patches also marked OC.
Inside Cimatron E8, use Help / About Cimatron E, and note the product number. The "OC" versions of the software will clearly
show the letters "OC" at the end of the product number.
To our best knowledge, these are the processors that support SSE2 formatting, and would allow install of the "regular" E8 version.