I modified the code from NothinButNet’s Glass project on CodePlex to run continuously and monitor for the following windows:
PuTTY (putty.exe)
Windows Command Prompt (cmd.exe)
Powershell (powershell.exe)
Telnet (telnet.exe)
There isn’t a way to stop it once started other than killing the task (taskkill /f /im glass.exe) or however you choose.
You can pass the original parameters to it still if you want by either a shortcut or however you want and it will work so you can set transparency level, etc. You can throw it in startup folder to start with Windows or whichever method you prefer.
Here’s a screenshot of default transparency (200):
Download binary file here: Glass.zip
Download source here: glass-15166.01_source.zip