دستور msg در ویندوز 7 همین کارو انجام میده

Click on the Start button, type CMD in the search box and press Enter.
Next, test MSG.EXE by typing the following command:


C:'Windows'system32>msg /?
Send a message to a user.

MSG {username | sessionname | sessionid | @filename | *}
[/SERVER:servername] [/TIME:seconds] [/V] [/W] [message]

username Identifies the specified username.
sessionname The name of the session.
sessionid The ID of the session.
@filename Identifies a file containing a list of usernames,sessionnames, and sessionids to send the message to.
* Send message to all sessions on specified server.
/SERVER:servername server to contact (default is current).
/TIME:seconds Time delay to wait for receiver to acknowledge msg.
/V Display information about actions being performed.
/W Wait for response from user, useful with /V.

توی ویندوز xp برای اینکه بتونیم پیام بفرستیم باید سرویس Messenger رو فعال می کردیم ولی در 7 :

On the machine that you cannot message to:
Use regedit to navigate to: HKLM\SYSTEM\CurrentControlSet\Control\Terminal Server
Then change the following value:
Name : AllowRemoteRPC
Type : REG_DWORD
Value : 1
Reboot. Now it should work.