This course deepens the knowledge and skill obtained in the course of Machine level programming (ISU) and in the course of Operating systems (IOS) with the main goal of allowing the students to understand the image of a crashed system (the so-called crash dump). Knowledge of programming on the level of assembler and application binary interfaces (ABI) is applied on a real Unix operating system. Within the course, various binary files used in the system are discussed, including their structure and their disassembled contents. The course involves a detailed study of compiler output from the point of view of linkage and run of system code as well as a discussion of differences and relations among various processor architectures, compilers, and application binary interfaces. Next, the course presents selected concepts typical for kernel-level programming whose deep knowledge is necessary for analysing functionality of an operating system kernel. These concepts include, among other, details of interrupt processing, task queues, process/thread synchronisation and memory management inside the kernel, i.e., the so-called SLAB allocator. Knowledge obtained in this way is used as a basis for presenting possibilities of monitoring the behaviour of an operating system on the binary level during its run as well as analysis of images of system memory after a system crash (crash dump analysis). In both cases, usage of tools shipped within common Unix distributions is accented.