Commands:
\uncover<n-m>{}: uncover content only for slides n-m (syntax “n-” or “-m” allowed)\only<n-m>{}: same as \uncover, except it doesn't reserve space for slides other than n-m\alt<n-m>{}{}: uncover first argument for slides n-m, and second argument elseEnvironments:
textblock in order to put content at any given place: \usepackage[absolute,showboxes,overlay]{textpos} %\TPshowboxestrue % for development, comment when done \TPshowboxesfalse % uncomment to hide boxes \textblockorigin{10mm}{20mm} % positions origin
\begin{textblock*}{110mm}[0,0](0mm,20mm)
\end{textblock*}