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Multitasking, the ability to run several processes at the same time, is a feature of most modern computer operating systems.
process-based multitasking is the feature that allows your computer to run two or more programs concurrently.
Multitasking
timestamp
Modular interfaces enables easy switching of connections
Working.
A necessary feature for a pattern is repetition or predictability. Patterns are defined by the regularity in which elements are repeated or follow a specific sequence. Without this feature, it would not be considered a pattern.
Windows Vista Ultimate
repetition
auto-switching power supply
I think you mean aero user interface. Aero is a feature in most Windows 7 operating system packs today. It allows the user interface (the edges and tops of windows and the task bar) to look transparent and glassy This feature is purely cosmetic and serves little purpose but to make the operating system look fancy. It is not necessary or vital to you PCs running.
As with all computers early mainframes did not multitask (early microcomputers did not multitask, early minicomputers did not multitask, early supercomputers did not multitask). Now almost all computers multitask. Multitasking has nothing to do with the size of a computer, it is almost entirely a software feature of the OS running on the computer.