Net send

Sends messages to users, computers, and messaging names.

Syntax

 net send {name | * | /domain[:name] | /users} message 

Parameters
Parameter	Purpose
name	Specifies a username, computer name, or messaging name.
*	Sends the message to all names in the domain or your workgroup.
/domain[:name]	If name is not specified, it sends the message to all the names in the domain. If name is specified, the message is sent to all the names in the specified domain or workgroup.
/users	Sends message to all users currently connected to the server.
message	Specifies the message text.