Pathweb

The Pathweb was the (unnaturally) shared intelligence of the Daleks, containing information on their history and experiences. It was more a telepathic link than it was a true hive mind. (TV: Asylum of the Daleks)

At one point Daleks had a command network which one Dalek could use to contact all others to share information. (AUDIO: Jubilee) The Sixth Doctor once described it as "artificial telepathy between Daleks." (AUDIO: The Curse of Davros) Susan Mendes and Kalendorf were able to hack into the Dalek Emperor's command network and cause all Dalek technology to self-destruct, creating the Great Catastrophe. (AUDIO: Dalek War: Chapter Four)

The Doctor once attempted to hack into the Pathweb, but was unsuccessful. When several inmates of the Dalek Asylum attacked his eleventh self upon recognising him, Oswin Oswald, already part of the Pathweb because of her conversion into a Dalek, deleted all information connected with the Doctor from the Pathweb. This resulted in all memory of the Doctor by the Dalek race being forgotten. (TV: Asylum of the Daleks) Despite Oswin's efforts, the Daleks regained knowledge of the Doctor from Tasha Lem during the Siege of Trenzalore. (TV: The Time of the Doctor)

"Rusty" had access to many Dalek memories of events in which he did not participate, presumably through the Pathweb. He accessed Henry Van Statten's "Metaltron" exterminating Bywater as it escaped the Vault (TV: Dalek) and Davros's New Dalek Empire attacking the Valiant during the 21st century Dalek invasion of Earth. (TV: The Stolen Earth) The destruction of the Daleks, the fleet and the Crucible at the failure of said invasion (TV: Journey's End) were memories shared by both Rusty and the Twelfth Doctor, (TV: Into the Dalek) as discovered when the Doctor formed a telepathic link with Rusty. (TV: Asylum of the Daleks)