The jury in the trial of Graham Dwyer for the murder of Elaine O'Hara in August 2012 has been hearing evidence about data extracted from iPhones and an Apple MacBook belonging to Ms O'Hara.
Garda analysts have been explaining to the court how data was extracted from the phones and from deleted files on the laptop.
Mr Dwyer has pleaded not guilty to the murder of Ms O'Hara on 22 August 2012.
Her remains were found on Killakee Mountain in Rathfarnham on 13 September 2013, more than a year after she went missing.
The court heard an 083 number became of particular significance to gardaí investigating Ms O'Hara's disappearance in 2012 and after her body was found.
One message relating to this number recovered on the MacBook said the sender was "looking forward to getting a new bike" the next day to try and lose weight.
The person said they "must get fit for the murder".
Another message relating to the 083 number said "terrible. 15 per cent pay cut and came 5th in flying".
The court has been told the 083 number was stored in Ms O'Hara's phone under the name "David".
And the jury has been told the number was stored in a diary entry on her computer as "Graham's phone number'.
The jury heard from a witness who extracted data in August 2012 from two iphones found by gardaí in Ms O'Hara's apartment.
The court was told that the witness must remain anonymous as he is a member of the Criminal Assets Bureau, whose officers are entitled to anonymity.
The jury was told his anonymity related to his role in the Bureau and not to his role in this investigation.
He was described as financial crimes analyst number 2.
He also extracted data from an Apple laptop belonging to Ms O'Hara in January 2014.
The court also heard evidence from Detective Garda Brid Wallace of the Computer Crime Unit who also examined Ms O'Hara's Apple laptop.
Det Gda Wallace told the court she made a forensic copy of the hard drive of this computer in September 2013 which allowed her to work on the copy while leaving the original computer untouched.
She said another Garda had done some work previously and she knew that an 083 phone number was of particular significance.
Messages from this 083 number had been found on Ms O'Hara's phone and the number was saved in the phone as "David".
She said she became aware text messages were stored in databases which is called unallocated space on the laptop.
This is space where a file might have originally been stored but had since been deleted.
The file remains on the computer, the court heard, but is now in unallocated space and can be overwritten.
The court heard the databases can be intact or un-intact - which means they may have been partially overwritten.
Ms Wallace said she ran a search using special forensic software and found a calendar entry which the jury heard about last week.
This was a diary entry on Ms O'Hara's laptop which described the 083 number as "Graham's phone number".
The court is hearing from Sergeant Alan Browne, also from the Computer Crime Unit, who extracted text messages from the intact and u-nintact databases.
Sgt Browne has showed the jury examples of how he extracted the data and how he interpreted it to make it readable to human eyes.
The court has heard another text message sent from an 083 number of interest recovered from Ms O'Hara's laptop, reads "Yes, beautiful baby girl" and gives the name of a child.
It continues: "Glad u enjoyed the other night many more sessions like it to come! See u sometime over the weekend!"
The message was sent on the morning of 31 March 2011.
It was received by the iPhone that was being backed up to the laptop.
A fourth message read " Sir any chance you get an 086 phone sim I get free texts?.."
This message was sent from the iPhone to the 083 number on 15 November 2011.
A fifth message shown to the jury was sent from the 083 number on the same date and read " No problem. Away in poland from tomorrow so see u sunday?"
Sergeant Alan Browne said he interpreted many more messages.
The court heard the content of all messages will be shown to the jury in due course.
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