Powermenu is tiny freeware which adds few menu items to standard control menu for all windows. While running it will show a Tray icon, which can be used to close the program. Closing the program will remove all the new menu items added.
The new items added are
Transparency - Set the transparency of any window between 0% to 100%, 0 means opaque and 100% means invisible.
Always on top - Any window can be set to be on top of all other windows using this option
Minimize to Tray - When this option is true, when that program is minimised it will stay in Tray instead of task bar
Priority - Specify how much priority Windows should give to the program. Default will be Normal, It can be changed to RealTime, Highest, Above Normal, Below Normal and Lowest.