shellF :: String -> F a b -> F a b
shellF title fudget
shellF
is the normal way to create a shell window (a top level window) for an
application. An argument fudgets determines the contents of the shell window.
title :: String
fudget :: F a b
shellF "Hello" (labelF "Hello, world!")
Underlying implementation: XCreateSimpleWindow in the Xlib Reference Manual .