The "query user" command is a useful tool in Windows operating systems for system administrators and power users who need to manage and monitor user sessions on a computer or terminal server. This command provides information about users who are logged on to the system, including their session names, session IDs, and the status of their sessions. This can be particularly useful in multi-user environments or when troubleshooting user access issues.

Examples:

1. Basic Usage of "query user":

   To display a list of all users currently logged on to the system, open the Command Prompt and type:

   query user

   This command will output a list of users, showing details such as the username, session name, session ID, state, idle time, and logon time.

2. Query a Specific User:

   If you want to check the session details for a specific user, you can specify the username as an argument:

   query user username

   Replace "username" with the actual username you wish to query. This will display information only for the specified user.

3. Query User on a Remote Computer:

   To query user sessions on a remote computer, use the /server switch followed by the name of the remote computer:

   query user /server:RemoteComputerName

   Replace "RemoteComputerName" with the actual name of the remote computer you want to query. This requires administrative privileges on the remote machine.

4. Using "query user" with PowerShell:

   While "query user" is a command-line tool, you can also execute it within a PowerShell script or session. Simply call the command within PowerShell:

   query user

   This will produce the same output as in the Command Prompt.

5. Automating User Session Management:

   You can incorporate the "query user" command into batch scripts or PowerShell scripts to automate the monitoring of user sessions. For example, a simple batch script to log user sessions to a file could look like this:

   @echo off
   query user > C:\UserSessions.txt
   echo User session information has been logged to C:\UserSessions.txt

   This script will save the output of the "query user" command to a text file for later review.