o dam here you go:
Net sendSends messages to other users, computers, or messaging names on the network.
Syntax
net send {name | * | /domain[:name] | /users} message
Parameters
name
Specifies the user name, computer name, or messaging name to which you want to send the message. If the information that you supply contains spaces, use quotation marks around the text (for example, "Computer Name"). Long user names might cause problems when you use them as NetBIOS names. NetBIOS names are limited to 16 characters, and the sixteenth character is reserved.
*
Sends the message to all the names in your domain or workgroup.
/domain:name
Sends the message to all the names in the computer's domain. You can specify name to send the message to all the names in the specified domain or workgroup.
/users
Sends the message to all users connected to the server.
message
Required. Specifies the text of the message.
