msg

Send a message to a user or session. More information: https://learn.microsoft.com/windows-server/administration/windows-commands/msg.

Send a message to a specified user or session:

msg {{username|session_name|session_id}} {{message}}

Send a message from stdin:

echo "{{message}}" | msg {{username|session_name|session_id}}

Send a message to a specific server:

msg /server:{{server_name}} {{username|session_name|session_id}}

Send a message to all users of the current machine:

msg *

Set a delay in seconds for a message:

msg /time:{{10}}