Five Common Operating Systems. The operating system serves as the intermediary between the user and the software on all computing devices. Hemera Technologies/AbleStock.com/Getty Images. The operating system is the computer's most important piece of software.owever, it also differs from Mac OS X in that it can be installed on a variety of different computers from a host of competing manufacturers, offering the user more freedom of choice when it comes to hardware. According to Net Market Share, Windows is the most widely used operating system.
Migraine with aura is a type of migraine that has warning signs before the pain begins, called an aura. This used to be called classical migraine.he brainâs blood vessels constrict and this is thought to cause the aura. Soon after the blood vessels widen (dilate) and this is thought to cause the headache. Whatever the cause, the good news is that although painful, migraines with aura are not life threatening.
Atypical migraine headache with aura has six sub types. All these subtypes suffer with symptoms of aura but may or may not have typical migraine headache. Aura is predominant symptom and headache is of mild intensity.