Technical Requirements Netscape Navigator 4+ or Internet Explorer 4+ (Internet Explorer 5 or higher for Mac users). An audio card and speakers are required for audio w/ video. All movies are encoded in Real 8. QTVRs of Labs require the Quicktime plug-in. Some documents are in PDF format which requires the Acrobat Reader. Please note: Your browser may already include all of these plug-ins. Look for RealPlayer Basic, which is free - RealPlayer Plus is not required.