The Palm III, the latest version of 3Com's popular PalmPilot hand-held computer, will add infra-red support, more memory, and a curvier new design. The Palm III is based on an upgraded version of the Palm operating system. The Palm 3.0 OS is compatible with Windows 95 and NT and, after a software upgrade later this year, the Macintosh as well. It will have double the memory - 2 MB of Ram - of previous PalmPilots like the Personal and the Professional, in order to support more applications. The back-lit screen also will be more readable. And the infra-red support means that users will be able to save time by sending their Palm III documents directly to the printer, rather than through their desktop or notebook PC. While United States buyers will be able to get their hands on the Palm III next month, Hong Kong customers - unless they order via the Internet - will wait until mid-year. Even then, the US$399 device may be out of stock, if US buyers eagerly snap it up, according to Francis Fong, vice-president of Synergy, one of the PalmPilot's distributors. 3Com has sold nearly 1.6 million PalmPilots worldwide, with that figure to reach 2.2 million by the end of this year.