Without knowing the details of that software, 'server' is also often refferd to when talking about server-side software:
- Webserver (ie. Apache, IIS, ..)
- Database server (in case of software: Oracle, MySQL, ..)
I can only assume that they talk about the software, so if you can run both the webserver and database server software on a single machine, then i don't see a reason why it must be on 2 seperate physical machines.
PS This logic also works the other way: you can have 2 physical machines (servers) to run a single server function (load balanced webserver for example).
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