Indeed, the website.

Here’s how to kick people off of the server in case they leave for the day (or for lunch) and leave their RDC (Remote Desktop Client) open.

*open a command prompt to \windows\system32\dllcache

*type the following…: query session /server:etltst01

*type the following….: reset session X /server:etltst01
where X is the ID of the person to boot.

from http://www.howtogeek.com/howto/windows/command-line-hack-for-terminal-server-has-exceeded-the-maximum-number-of-allowed-connections/.