das1969

Here's some details on callback [http://www.growlforwindows.com/gfw/help/gntp.aspx#callbacks](url) A while ago I got the c# source for GMail Notififer Plus from github, and amended it to send new mail notification growls. I...

There's a list of growl integration libraries on the growl for windows [developers page](http://www.growlforwindows.com/gfw/developers.aspx). The C# library I used was a Visual Studio solution containing examples of GNTP with callback.