SAP Netweaver Landscape

Hi Experts, my question is if there is a sap note or link within the help to tell me if I can have two production systems within the same box, I found this link on the help but it is still NOT very clear the subject since there mention that it is not recommended to have more than one system (DEV or QAS) within the production server because it would have to stop production while developing but. It is posible make them live two production systems on the same box?

Here's the link:

http://help.sap.com/saphelp_nw73/helpdata/en/63/a30a4ac00811d2851c0000e8a57770/content.htm