When using Windows XP and previous operating systems one could easily send messages from one computer to another by using the "Net Send" command from the command prompt. Typing a command like this:

Net send Support "Please contact help desk immediately!"

Would result in the computer searching for the location where the user Support has last logged on, or in case of a computer, where the computer called Support is listed, and would send that message to that user or computer. You should note that this method of sending messages was made available by the Messenger service running on the target machine. Without it, there could be no messages transmitted to that computer.

Note: Windows XP SP1 (or was it SP2? I can't remember right now) disabled the Messenger service by default. So does Windows Server 2003 SP1.

Long story made short, when using Windows Vista one might go looking for the "Net send" in Vista and wonder where it went. There is NO "Net send" command in Vista… However, there is a solution. You can use MSG.EXE instead.

Note: Apparently Windows Vista Home Basic and Home Premium editions do not have the msg.exe command installed. It does work on Vista Business, Enterprise or Ultimate edition.

Click on the Start button, type CMD in the search box and press Enter.

If your Windows XP is not licensed and your computer is connected to internet, it is very possible to get the newest Microsoft update in form of WGA Notification - Windows Genuine Advantage Notification or GENUINE warning.

This update will remind you all time that your Windows XP Operating System is not licensed and it will give options for licensing. Also when your system is already started, the WGA process is always active in your taskbar and there is no way to turn off because it will be started again automatically and continue with annoying warnings.

But here is simple tutorial how to remove genuine warnings:

1. First - click Start then Run and type “regedit” without quotes and press Enter
2. Go to My Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify. In this location delete the folder “WgaLogon” and all content with name WgaLogon. If there is no WgaLogon folder continue with next steps.
3. Restart your computer. After restart WGA will not be active and you can remove it completely following the next steps:
4. Set your folders options to show hidden and protected Windows files – go to My Computer/Tools/Folder Options and then choose View. From the View tab choose “Show hidden files and folders” and uncheck “Hide protected operating system files” and click OK
5. Now, Go to folder Windows\System32\dllcache, find and delete “WgaTray.exe”. Also, check for "WgaTray.exe" in Windows\System32\, and if you find it delete it, and search for "Wga*.*" with Start-Search-All files and folders and delete everything that starts with "Wga" (Wgatray.exe; Wgalogin.dll, Wgasetup; etc..)
6. Restart your computer again and live happy and free.