One day after the real Steve Jobs unveiled a redesigned iMac, Apple released a security update for it.

Apple released very little information about the release, saying only that the security update "provides important bug fixes." The company also noted in a short advisory that the fixes are recommended for 20-inch and 24-inch iMac models with 2.0 GHz, 2.4 GHz, or 2.8 GHz processors.

Apple did not supply any information on what bugs are being fixed.

The company also issued a new version of its software that is designed to enable Intel-based Macs to run Windows XP. Still in beta, Boot Camp is billed as being able to enable users to install Windows XP or 32-bit Windows Vista without moving their Mac data.

An Apple advisory noted that Boot Camp V1.4 adds updated graphics drivers, an improved driver installer, improved international keyboard support, updated Windows Help and Apple remote pairing.

On Wednesday, Jobs focused on Apple's Mac-oriented hardware and software, noting that the company's Mac sales had grown three times as fast as other manufacturers' PC sales over the past four quarters.

The new iMacs have been generating a lot of online buzz. They're thinner than before and encased in aluminum and glass for easier recycling.

The new iMacs come in two models: 20" ($1199, $1499) and 24" ($1799). They feature Intel Core 2 Duo chips, running at up to 2.8 GHz, with 4 Mbyte of shared L2 cache and up to 4 Gbyte of DDR2 SDRAM memory. They come with either the ATI Radeon HD 2400 XT, 128 Mbyte of GDDR3 memory, or the ATI Radeon HD 2600 PRO, 256 Mbyte of GDDR3 memory. And they now support up to 1 Tbyte of internal hard disk storage.