Hi,
In the RDPDFViewController class of the demo project, you can find the m_view and m_doc initialization in the PDFOpen method, that allows to show one pdf.
you can show multiple pdfs at the same time using multiple m_view and m_doc (m_view1, m_view2... m_doc1, m_doc2...), giving the correct frame to each PDFView instance.
For example:
m_view1 = [[PDFView alloc] initWithFrame:CGRectMake(0, 0, rect.size.width/2, rect.size.height)];
m_view2 = [[PDFView alloc] initWithFrame:CGRectMake(rect.size.width/2, 0, rect.size.width/2, rect.size.height)];