documentclass{article}

begin{document}
topskip=0pt
vspace*{fill}
TEXT TEXT TEXT TEXT
vspace*{fill}
pagebreak
end{document}

documentclass{beamer}

geometry{paper=a4paper,vmargin=0pt}
setbeamertemplate{navigation symbols}{}

begin{document}

begin{frame}[allowframebreaks]

foo
framebreak

bar
end{frame}

end{document}

documentclass{article}
usepackage{atbegshi}
usepackage{lipsum,graphicx}
AtBeginDocument{topskip=0ptvspace*{fill}}
AtEndDocument{vspace{fill}}
providecommand{mypagebreak}{parvspace*{fill}clearpage}
AtBeginShipout{parvspace*{fill}}
begin{document}
TEXT TEXT TEXT TEXT
mypagebreak
More TEXT TEXT TEXT TEXT

mypagebreak
lipsum[2-7]
end{document}