Projectors for computers are a growing portion of the US$10.5 billion business presentation market, but they still are not the biggest part, PA Consulting says. Black and white or colour paper-based presentation hardware this year would still hold a larger market share - 24 per cent - than electronic media with 22 per cent. The business presentation market still is dominated by 35mm slide systems. However, the growth in computer projector sales is pushing other presentation devices - for example, no presentation is possible without a suitable screen. Interactive electronic whiteboard - also called electronic flip charts - such as 3M's Ideaboard IB 3000 or ASK's Smart boards - are taking the traditional screen systems a step further. Basically, they are large touch-screen, or white, boards on which presenters can write and project images. Notes jotted on the board and still images are instantly captured and can be saved on a PC, printed out, e-mailed, faxed or networked, so that they can be quickly and accurately distributed immediately after a meeting. According to 3M, these systems enable meeting participants to be more focused and more productive because they do not need to take notes. They cost about $40,000. Visualisers look like overhead projectors but can handle 3-D objects by using several camera systems. When connected to a projector, images of an object placed in the middle can be projected through different angles. Visualisers are mostly used for education or product training and cost about $20,000 from manufacturers such as Polycom. Japanese firm Avio went as far as incorporating a visualiser in a projector, turning the MP-200 into an all-in-one multi-purpose LCD projector which can project the image of printed matter or 3-D objects, project videos or PC-based presentations. It costs $40,000. Control panels are like sophisticated remote controls which enable a presenter to control his slide show or presentation, from the touch screen.