Each PC or web server is run by an Operating System - the low-level program that communicates with the hardware, including peripherals such as a mouse or a printer, together with any applications that are installed on your system. Any program input through a command line or a Graphical User Interface (GUI) is processed by sending an Application Program Interface (API) request to the OS. On a server, each and every application runs within the parameters set by the OS as well - priority, physical memory, processing time, and so on. This is valid for both standard Internet site scripts and server-side software like a media server. If a virtual server is set up on a physical one, there can be two independent Operating Systems, referred to as guest OS and host OS, which means that you'll be able to set up a different software environment on the same machine.
Multiple OS in Dedicated Hosting
If you decide to purchase one of our dedicated servers, you'll find three Operating Systems on the registration page because we want to give you a wider choice regarding the system environment on the server as different apps can have particular requirements. CentOS, Ubuntu and Debian contain different modules developed by their vast support communities, so you can select any of these OSs and enjoy a stable and risk-free hosting service. Depending on your choice, you will also have different Control Panels to choose from. Needless to say, we can always replace the Operating System in case the one you have selected in the beginning doesn't meet the requirements of the software which you would like to run. We can also upgrade your OS on a regular basis in order to keep it as risk-free as possible using our Managed Services upgrade package.