MediaPortal Tray Launcher is a small utility that aims to allow MediaPortal users to launch it via the green Start button of their remote control. A utility designed for this purpose already comes with MediaPortal. However, the original utility is only compatible with remote controls specifically designed for Windows Media Center. MediaPortal Tray Launcher is for people who, like me, don't have such a remote control.
Not maintained anymore
Since I didn't use MePo for three years now, I didn't keep MPTray updated. It should continue to work for MePo 1.x, I don't know for 2.x. However, the source code is located here: https://forum.team-mediaportal.com/attachments/mptray-0-5-ahk-zip.186436/ Use it at your will, folks! :)