But Openshaw interrupted questioning about a web forum containing posts by alleged Islamist radicals, saying that he did not fully understand some of the terms involved.
"The trouble is I don't understand the language. I don't really understand what a website is," he told the court.
"I haven't quite grasped the concepts."
The judge is facing a tough time in court today as a computer expert will be testifying on technical aspects of the case.
Younes Tsouli, 23, Waseem Mughal, 24, and Tariq al-Daour, 21, all deny inciting another person to commit an act of terrorism "wholly or partly" outside Britain.
Tsouli and Mughal are also charged with conspiracy to murder, and Al-Daour for conspiring with others to defraud.
Judge baffled by the term 'website'
By Iain Thomson on May 18, 2007 10:42AM
Judge Peter Openshaw is presiding over a trial in Woolwich Crown Court of three men accused of inciting terrorism over the internet, but has halted the trial to have the word 'website' explained to him.
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