Michael Jackson's teenage child sex accuser testified on Wednesday that he slept in the star's bedroom and surfed Internet pornography sites with him the first time they met.

The 15-year-old cancer survivor also told Jackson's trial that Jackson affectionately called him Applehead" or "Doo doo head" and that he thought that the superstar was "the coolest guy in the world ... my best friend ever."

The youth told the "King of Pop's child molestation trial that Jackson had phoned him when he was ill in hospital and immediately invited him and his family to visit the musical icon's Neverland Ranch.

The boy, who had short-cropped hair, was composed and spoke in a low monotone as he faced his alleged molester for the first time since Jackson's arrest in November 2003.

The youth said he, his younger brother and Jackson were talking in the star's office during their first visit Neverland in California in 2000 or 2001 when Jackson suggested the boys spend the night in his room.

"We asked our parents if we could sleep in Michael's room and my parents said, 'yeah we could,'" he said, adding that Jackson had dubbed his younger brother "Blowhole." In the bedroom, one of Jackson's aides began tapping on a computer and calling up racing websites filled with images of naked women, the boy said. "We started looking at adult material sites," he told the jury.

At one point, while the boys and Jackson were looking at a picture of a woman lifting her shirt and exposing her breasts, "Michael said, 'Got milk'," the boy said in testimony that was clear and precise.

The youth then turned to the making of British journalist Martin Bashir's documentary Living With Michael Jackson, which sparked the media firestorm that led to the investigation into the star's relationship with the young cancer patient.

The young witness suggested he had been duped into making the film, that was shown around the world, saying Jackson had told him it was an "audition tape" and that he had believed it to be a home video.

Before Bashir began filming Jackson and the boy, who were seen on screen holding hands, the star took the youngster aside and coached him on what to say in front of the camera, the boy claimed.

"He told me to say he helped me, and that he pretty much cured me of cancer," the boy told jurors, adding that he though Jackson would put the film away and "keep it for himself."

In fact the broadcast of the film in the United States on February 6, 2003, prompted an investigation that led to Jackson's arrest nine months later.

The boy, who claims Jackson abused him on at least two occasions in February or March of 2003, is seen as the most crucial prosecution witness in the celebrity trial.

"You recognise the defendant?" prosecutor Thomas Sneddon asked the boy after he was sworn in as a witness at the trial in the California town of Santa Maria, near Neverland.

"Yes," replied the boy. "Who is that?," Sneddon asked pointing out the faded "King of Pop," who was sat on the defendant's bench alongside his lawyers. "Michael Jackson," the boy replied.

Jackson is charged with denied 10 counts, including child molestation, plying the boy with alcohol to seduce him and conspiring to kidnap the accuser and his family and hold them prisoner at Neverland.

The 46-year-old superstar has denied all the charges and his lawyers have painted the young accuser's family as rapacious financial predators with a history of concocting stories to win cash settlements.

The boy, who was a 13-year-old recovering cancer victim when he was allegedly abused by Jackson, told the jury that could jail the star for up to 20 years that he and his siblings were abused by their father.

He said his mother and father, who are now divorced, would fight "every day" and that his dad beat him, his brother, who is two years younger, his older sister and the children's mother.

"Were you ever hit?" Sneddon asked the nervous youngster. "Yes. I was not hit as much as my mum was, but he hit me sometimes. I saw him hit my brother a lot on the head. He hit my sister sometimes too," the boy said.