Operating Systems

1- file creation and deletion.

2- directory creation and deletion.


3- primitives for file/directory manipulation.


4- mapping files onto secondary storage.


5- backup files on stable state.




amr abdelaziz

Picture in Picture

In GUI the os which are preloaded for the application either by point & draw device or URL path are reffered as GUI system.whereas kernel are primarly stored in the contacted area of memory & not accessible for user application.

The 'Re-Start' could be caused by a virus. Vheck out you system using Norton Anti-Virus or some other virus checking program and see if there is a bug in yours. The automatic shutdown could also be caused by a virus or it could be in your system setup under 'Power Schemes' and the thing is actually going into Hybernation or Stand-By, but from the first part of your question, you should look more at a virus as the cause.....

The special purpose of the operating system is to manage the computer hardware resources. The operating system also provides common services for the computer programs.

true

A typical real-time operating environment we note that the computer system has an interface which is embedded within its environment. The operating system achieves the desired extent of regulation as follows:

1. Sense an event: The system monitors its operative environment using some sensors. These sensors keep a tab on some measurable entity. Depending upon the context of use this entity may be a measure of temperature, or a stock price fluctuation or fluid level in a reservoir. These measurements may be eriodic. In that case the system would accept an input periodically. In case the measurement of inputs is taken at specified times of operation then the OS may schedule its input at these specified times or it may be interrupted to accept the input. The input may even be measured only when an unusual deviation in the value of the monitored entity occurs. In these cases the input would certainly result in an interrupt. Regardless of the input mode, the system would have an input following a sensor reading (which is an event).

two difficulties taht you think could a rise with such a scheme?

The latest commercial network operating systems are Windows Server 2008 R2 and Mac OS X Server Snow Leopard.

if your computer has a slow disk drive and you are doing a lot of paging (using virtual memory) to switch from one program to another rapidly, then your disk drive will become a performance bottleneck and your computer will seem to have trouble keeping up with your commands. The computer, here, is "thrashing", spending all of it's time trying to keep up. Imagine a person drowning. They are thrashing because they are spending all of their energy doing one thing to stay alive.

input/output (I/O) system management

A special case of multiprogramming in which users access the computer through terminals, typically the devices with keyboards and screens. Dozens of users share the computer at once. The computer actually does not run them all simultaneously but it runs a small portion of ones user's job then moves the service to the next user providing service to each user several times and then it appears that is is actually doing all its actions at one time but it's not. After all the requests are done they all get responses about the same time.

A virtual machine will provide generic hardware that can be found in many other computers. Having a virtual machine eliminates the need to have either a second system, or to reboot to test their operating system.

The main function of NOS is to provide server type of role to enhance support or make a working network.

what is the whole meaning of having the title on the top and ads on the side of the website without any information relating to the topic.

MS-DOS is only capable of single-tasking without the use of rather complex TSRs. It also supports only a single user, has no access controls, no memory protection, and by default can only address 640 KB of RAM.

A timeshare is a system that allows families to use a condo at specific times of the year. Each family pays toward the cost of the condo, and each group gets to use it whenever it is unoccupied. This allows people to afford a vacation property without taking on the entire cost.

A stand alone operating system is a system that is independent of another for example windows 3.1 ,95,98 were all a shell based on the ms-dos operating system to put it in simpler terms windows was a dressed up version of ms-dos with all the bells and whistles to be more appealing to the eye and be more user friendly . later versions of windows were independent of the ms-dos operating system hence they are known as "stand alone operating systems" .

Most of the BANKS works on Mainframes which generally uses UNIX operating systems. But a BANK can use UNIX and flavours of LINUX (which is a UNIX flavor) and Windows Server ...

ClarisWorks

1) Pass parameters using registers(directly).

2) Store the parameters in a table in memory and the table address is passed in a register to the OS.

3) Push(store) the parameters onto a stack(by the program) and "pop" off by the Operating System.

a suit is a claim instituted by presenting plaint in a court of law. where as application is instituted by citing a proper provision of laws to move the court to hear such application.

Apple OS X

Microsoft Windows

Unix

Linux

VAX/VMS

OS4000

IBM System/360

DOS

IBM OS/2

RISK OS

Free RTOS

OS 2200

Exec 8

(There are lots more)