Beijing authorities have asked computer users to stop using the Chinese-language version of Microsoft Windows 95 because of anti-Beijing political messages that can appear suddenly on-screen when the program is operating. A notice requested that users of the version and Microsoft's Chinese upgrade software stop using the programs and 'personally seal up the disks'. The notice, which was issued on Wednesday by the security department of Beijing's China World Trade Centre to commercial tenants in the complex, also asked tenants to inform the security department, by 2 pm yesterday, of how many disks had been taken out of use. The request was in response to orders from 'relevant departments of the Beijing municipal government', but Teng Weiguo , the China World Trade Centre security official named as the contact on the notice, declined to say which city government department initiated the request. An official at the Computer Security Supervision Department of the Beijing Public Security Bureau yesterday denied his office issued the order. But according to several sources working in China's burgeoning computer industry, Beijing police have in recent days been confiscating copies of Windows 95 because of political slogans embedded in the software. The slogans, appearing only when the program is used for word-processing in complicated Chinese characters, are distinctly pro-Taiwan in nature. According to a Chinese user who has seen them, the slogans include 'Communist Bandits', 'Take back the mainland!', and 'Long Live the Three People's Principles!' The last phrase is a reference to a doctrine put forth early this century by Dr Sun Yat-sen in which he called for national unity, people's rights, and people's livelihood. 'It really is no big deal, but the authorities seem to be taking it very seriously,' said one computer industry source. 'After all it is just the work of some joker in Taiwan or at Microsoft's Seattle headquarters who is interfering with business people trying to do their work and interfering with Microsoft's business in China.' Public relations officer Theresa Jiang of Microsoft's Beijing office said yesterday the company was still investigating the matter and could not comment. She would not say where the Chinese version of Windows 95 was developed, nor would she speculate on whether the affected software was genuine or counterfeit.