The bail of Lindt Cafe gunman Man Haron Monis will be under the spotlight when the inquest into the Sydney siege resumes today.

The two-week-long segment of the inquest will also investigate the issues of terrorism, guns and the relationship Monis, 50, had with the community and cultural groups.

The inquest has previously heard the Iranian-born asylum seeker took staff and customers at the Lindt Cafe in Martin Place hostage on December 15, 2014, telling them "this is an attack, I have a bomb".

The siege ended about 17 hours later when Monis forced cafe manager Tori Johnson, 34, to kneel, before shooting him in the head with a sawn-off shotgun.

Officers from the Police Tactical Operations Unit stormed the cafe and shot and killed Monis.

At least two police bullets or bullet fragments hit Monis in the head and 11 other bullets of fragments hit his body.

Hostage Katrina Dawson, 38, was also killed when she was struck by six fragments of a police bullet or bullets, which ricocheted from the cafe's marble walls into her body.

Monis was on bail at time of siege

In the years leading up to his siege on the Lindt Cafe, Monis was bailed on several occasions for 43 charges of sexual assault, and being an accessory to the murder of his ex-wife.

In June, State Coroner Michael Barnes ruled that it was in the public interest for the inquest to examine the reasons why Monis was allowed to walk free on bail for such serious crimes.

"It is relevant and not too remote for an inquest to inquire into whether a person charged with numerous offences of violence was appropriately released on bail, if soon after that release, he is involved in further violent offences resulting in deaths," he said in his judgement.

"In both cases the decision makers are required to assess whether the person to be discharged/released is likely to harm others.

"When such harm ensures it is reasonable to review the basis on which the decision to release the person was made."

But the NSW Director of Public Prosecutions last week successfully applied to have dozens of documents and emails relating to the gunman's bail withheld from the inquest.

At a preliminary hearing in Sydney last week, Counsel for the DPP, David Buchanan, argued that the documents should be excluded from the scope of the inquest because they related to legal proceedings against Monis and that implied confidentiality.

"They are the subject of legal professional privilege," he said.

Katrina Dawson and Tori Johnson were killed in the siege. ( Supplied )

"It is so obvious that the communications in the documents were made by the DPP for the purpose of proceedings against ... Mr Monis."

An unsuppressed excerpt from one of those documents, an email from NSW Police Force Homicide Commander Mick Willing to his superior Assistant Commissioner Mark Jenkins, was read out at the hearing.

In the email, Commander Willing criticised the DPP's handling of Monis's case after the gunman was released on bail on a charge of being an accessory to murder in December 2013.

"Boss, it's a disappointing decision, that's for sure," he wrote.

"Dicko [Detective Inspector Jason Dickinson] advises me that the DPP solicitor was terrible and clearly was not across the brief."

DPP 'dragging feet': assisting counsel

The application to suppress the documents prompted an extraordinary outburst from counsel assisting the inquest, Jeremy Gormly, who accused the DPP of "ambushing" and "damaging" the progress of the inquest.

"The DPP have been dragging their feet on statements, dragging their feet on cooperation," Mr Gormly told last week's hearing.

"It is unacceptable to hear from the DPP that they have cooperated in every way."

Despite these documents being withheld from the inquest, the coronial investigation will still examine the reasons why Monis was granted bail, whether prosecuting authorities responded appropriately to his bail applications, and whether Monis's release on bail was causally linked to the siege.

The issue of terrorism and Monis's associations with terrorist groups will also be examined, including Monis's claims that the Lindt Cafe siege was an attack on Australia by Islamic State.

Senior officers within the NSW Police Force, solicitors from the Office of the Director of Public Prosecutions and other experts are expected to appear before the inquest.