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A distributed system is collection of indendent computers that appears to its users as a single coherent system. BY arvind yadav 0612613015 INDIA.
The most commonly used error alert style to prevent users from entering invalid data is the "modal dialog" or "popup alert." This style interrupts the user's workflow, displaying a clear message that indicates the error and often provides guidance on how to correct it. By requiring user acknowledgment before proceeding, it ensures that users address the issue before continuing. Additionally, inline validation messages can also be effective, providing immediate feedback as users input data.
Advantages of data flow diagram:· A simple graphical technique which is easy to understand.· It helps in defining the boundaries of the system.· It is useful for communicating current system knowledge to the users.· It is used as the part of system documentation file.· It explains the logic behind the data flow within the system.Disadvantages of data flow diagram:· Data flow diagram undergoes lot of alteration before going to users, so makes the process little slow.· Physical consideration are left out.· It make the programmers little confusing towards the system.· Different DFD models have different symbols like in Gane and Sarson process is represented as rectangle where as in DeMarco and Yourdan symbol it is represented as eclipse.
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This has traditionally been a feature of multiuser operating system that the command the system operator uses to command a reboot or shutdown allows the system operator to specify this time interval, then automatically notifies all logged in users to complete what they are doing and log off before that time runs out. Any users failing to log out before the time specified by the system operator expires will be automatically logged out and their tasks killed at the last moment before the system automatically reboots.
users
Use the 'who', 'w', or 'users' command to find out who is logged in.
There are a series of commands, depending on what and how much information you want on logged in users. The commands are: who w users finger (if installed)
Press Control, Alt, Delete. Alternatively, right click the taskbar and choose "Task Manager" from the context menu and you'll see the Task Manager. Choose the "Users" tab. It will list users currently logged in!
There are many ways to do this, but the fastest and easiest is to use the 'uptime' command, which will tell you in a summary line how many users are logged in.
Only one user at a time can be logged into Windows 2000 Professional. Any number of users can be logged into a Terminal Server; it isn't unusual for a large business to have 100,000 users logged into one server.
Instant Messenger is a program that allows two users to communicate simultaneously. You can download a program that allows you to do this on your computer.
who command gives the list of users who have currently logged in......
No. Multiuser operating systems create a shell for each user. It would be possible to see what each users was doing from a system administrator viewpoint but not form the normal logon window.
Non-logged in users can view nearly all the same content as logged in users. So they can view your account, boards, and pins, but are unable to see your followers and who you're following.
Task manager- users tab