It is almost impossible to imagine a computer today without the mouse. Pointing, clicking, double clicking are things we all do with carefree abandon. It was not always like this and anyone who remembers the first mouse - the one that looked like a can of beer with a bump on the top - will smile at today's models. At the computer expo, there will be on display many of the new designs and ideas that are being developed for both the mouse and the trackball. One of the companies prominent in this area is Logitech, a mouse maker with a long history. Logitech will be represented by its Hong Kong distributor, Longrand Electronics. Today, of course, we are no longer dependent on the mere mouse to move about the computer screen; we now have the ever popular trackball as well. Trackballs are particularly useful when the screen is large - more than 17 inches, for example, or where there is little desk space. The trackball, of course, just sits in one place, unlike the mouse that usually requires a pad and a bit of space on the desktop. Logitech will be showing off a new cordless mouse, the Cordless MouseMan Pro, at the show. As its name implies, this is a mouse without a tail. Although the cordless mouse sounds like a good idea, one must be cautious about the potential problems. How many people go home and spend the first few minutes searching for the remote control for the television? If you do not, then the cordless mouse may be just the thing for you. The less organised may well want to skip the tail-less mouse and look at the trackballs. Logitech will have four trackballs on display called the TrackMan Marble, TrackMan Live! Wireless PC Controller, TrackMan Vista and the TrackMan Voyager. In many of its wireless products, Logitech uses radio technology, not infrared, so it is not necessary to line up the two devices - the mouse or trackball and the receiver - as precisely as has been true with infrared. They can be further apart as well. The cordless mouse, for example, can be as far away as two metres. The TrackMan Live! Wireless PC Controller, on the other hand, can be as far away as 10 metres. All of the products on view are for IBM-compatible computers, not Macintosh computers from Apple. The reason for this is that Logitech does not feel there is a big enough market in Hong Kong for the Mac mouses it makes. If you are a Mac user and you do not agree, then perhaps you may want to show up and offer some advice.