I'm not sure what it's really called, but the menu right under the title bar of most applications. It would be nice to make my own popup definition for those.
Theres two way I can think of to implement this:
A Keyword for the popup definition:
menu @win {
Titlemenu
.File
..Load:/loadsomething
..<and so on>
}
A keyword for the menu windows's def:
menu @Win:Titlemenu {
<title menu here>
}