Syllable operating system will probably define a number of abstractions and services. These include processes, interprocess communication and synchronization, memory management, file systems and/or persistent storage of data, input and output, program loading and unloading, and possibly graphics, security, multiple processor support, network support, etc. In your oral and written reports, you need to explain what these abstractions and services are and how they affect the programming environment and the thought processes of programmers developing applications for the system. If one or more of the major abstractions or services is missing from your selected system, you should explain why it is not needed and how applications do without.