Whether you are a systems programmer who is brand new to z/VM, or you’ve just been away from the platform for a while and need a refresher, this session will provide useful information about the z/VM hypervisor kernel — called the Control Program (CP). We will start with an overview of CP and how it uses disk space, memory, and devices; followed by booting (‘IPLing’) your system; defining virtual machines and virtual networking; and the various ways you can interact with CP. We will conclude with an introduction to collecting diagnostic information for both testing and problem determination.