Compiling LaTeX in Apple products: is something like pdflatex around?
Have them download http://www.tug.org/mactex/. It contains all they need to edit (via TeXShop) and typeset (via a complete LaTeX distribution) LaTeX documents.

For the iPad, have a look at http://itunes.apple.com/de/app/tex-touch/id377627321?mt=8 and http://itunes.apple.com/us/app/tex-equation/id390366359?mt=8.