Chat clients are programs used to allow communication between individuals over the internet. For the majority of Homestuck this is the most common way for characters to communicate to each other due to the distance between each other. The Sburb players have all used online handles with an abbreviatory connection to genetics. The choosing of a chumhandle seems to follow the pattern of two descriptive words, the first lowercased while the second's first letter is capitalized (Example, turntechGodhead). In addition to this, each character appears to choose their handle according to their personality or interests.

PesterchumEdit

Pesterchum is the client of choice for the kids, with the exception of Jane Crocker, who uses Betty Bother. Users are called "chums" and chatting is referred to as "pestering".

Pesterchum has a chumRoll for storing a user's friend list and a trollSlum that blocks listed users from contacting them. A user can also select their current mood from a list of emotions.

Three different versions of Pesterchum have appeared in the story:

• Pesterchum 6.0 - An older version of the client. There are six different moods a user can choose from: Chummy, Chipper, Palsy, Bully, Peppy, and Rancorous. The first five are represented by the same happy face emoticon while Rancorous gets its own angry face emoticon.
• Pesterchum 7.0 - The successor to 6.0. There are nine different moods: Chummy, Mystified, Amazed, Insolent, Bemused, Pranky, Smooth, Pleasant, and Rancorous. Unlike 6.0, every mood gets its own unique emoticon.
• Pesterchum Enamel - The version used by Jade Harley. It is advertised as being "Much Shinier!" than the other versions.

Dirk Strider and Roxy Lalonde use a special version of Pesterchum provided by Calliope. The client has been modified with alien technology (likely related to the software that powers Trollian) that lets them communicate with Jane and Jake. Whenever a message is sent from 2424, Jane or Jake will receive it at the corresponding time in 2011, creating the illusion that all four kids live in the same time period.

TrollianEdit

Trollian is the troll version of Pesterchum, the name likely a reference to the real-life Trillian instant messenger client. Its users "troll" each other, and like Pesterchum, users choose pseudonyms, called "trolltags." In the trolls' cases, these generally relate to their associated zodiac sign or other defining trait. Together with the Kid's handles, their abbreviations comprise all sixteen possible combinations of genetic bases.

Trollian features a ChumpRoll, a similar sort of Rolodex to Pesterchum's ChumRoll. When Karkat, Terezi and Kanaya use Trollian, they themselves are listed on it in addition to all the other trolls. Whether this is a part of Trollian or their personal preference is unknown.

In Hivebent, Karkat tries out the beta version of Trollian in order to talk to the other trolls, all of whom seem to already have it.

Interface and functionsEdit

Trollian has the ability to chat with a person at any time on their timeline up to their death or other obscuring event (such as interference by void powers). It has also been shown to possess the ability to communicate with the kids in the universe the Trolls created, as well as access a visual feed of them by using the viewport activated by the f1 key, though loss of this key has a tendency to render this feature moot. Consequently, the trolls claim to be able to see and chat with the kids at any point in their timeline, though they later admit they cannot see or talk to the kids after the Scratch, seemingly because the Scratch erases them completely.

Blocks employed by the kids seem to have no effect on the trolls. Whether this is an inherent feature of Trollian's superiority or the work of a certain hacker is unknown. It is possible for the Trolls to effectively block each other however, as seen when Terezi's trolltag is blocked by Karkat due to Gamzee earlier using her glasses, and she receives the error "did not receive message" when attempting to contact him. Eridan also states that Vriska blocked him at some point in time.

Since the Trolls' contact information remains in Pesterchum, it is also possible for the kids to initiate a chat. However, several times this has resulted in them contacting a totally different time than they intend to, as a result of Pesterchum's inability to select a specific point in time they want to contact.

Trollian also has a bulletin board feature that's main function appears to be conversations between more than two people, similar to a party-line, and is both visible and respondable to users in both the past and future. Karkat abuses this function in a notably hilariously self-defeating manner, to the point of repeatedly banning himself from different points in the timeline. The length of a ban is unknown, though in this conversation Karkat repeatedly gets banned by Terezi yet quickly begins responding again, each ban spanning only about 1-3 minutes. Considering the memos are designed for temporally distant conversation, drastically impermanent banning makes a decent amount of sense, as a ban too long would essentially be banning multiple users (albeit all the same person), not all of whom might need banning.

To manage Trollian's ability to send messages through time, it displays an arrow-shaped timeline for each user. The interface also includes grey bars, behind each arrow, that indicate when each person on the timeline entered the Medium. When an individual time-travels to create a stable loop or arrives in the alpha timeline from a doomed timeline, Trollian displays each loop and doomed self as different timelines and splits them into different shades. A bright color indicates presence, while timeframes in which a player was not present due to time travel are displayed in a darker color. If a doomed timeline copy of a player dies, their timeline will turn dark grey after the point of death. Why the screen never appears totally overwhelmed with the timelines of the doomed Aradiabots is uncertain, perhaps because this graphic only opens when trolling the individual, or must be activated similar to the viewport.

Trollian displays the Scratch as bright lights and swirling black and white lines. Curiously, when Kanaya scrolls up into the future of the trolls' timelines, she sees the exact same swirls and lines, despite the Troll's session not undergoing a Scratch at the time. In this case the swirls and lines might indicate the Troll's escape into the Furthest Ring, where space and time are unstable.

SpeculationEdit

Davesprite may use Trollian via his iShades, as his conversations with Terezi begin with "turntechGodhead [TG] began trolling gallowsCalibrator [GC]'. However, this is very unlikely since in his conversation with Alternate Future Rose, Alternate Future Dave (later Davesprite) states that they lost all contact with the trolls after the timeline split.

BettyBotherEdit

BettyBother is a Crockercorp chat client, albeit potentially only existing post-scratch. Jane Crocker uses it even though she clearly shows contempt towards it and outright says Pesterchum is better; brand loyalty is a powerful thing. Her friends use Pesterchum instead, however, so it appears there is cross-program compatibility between BettyBother and Pesterchum, much like Trollian. While Pesterchum labels chats as "pestering" Bettybother uses the term "bothering" instead.

It is full of spam and popups, all of which contain subliminal messaging from the Batterwitch.

Notable examples include:

1. Be the first to visit Mars - OBEY
2. Hamburger Helper Ad - CEASE REPRODUCTION
3. Guy Fieri - STAY ASLEEP
4. Gushers Ad - CONSUME
5. BCCORP stock market graph - SUBMIT

These subliminal messages are reminiscent of the movie They Live, where most billboards and advertisements were encoded with subliminal messages giving similar messages such as "OBEY" and "CONSUME." Also, the Battleship Condescension, the Condesce's starship, conspicuously appears in the travel advertisement.

OtherEdit

The cherubs, due to their unique alert messages, "Cheering" and "Jeering" respectively, may be using a different chat client than the others. Given its demonstrated timejumping ability and viewfinder of the Post-Scratch Kids, it can be assumed that it is in some way related to Trollian, however, by at least shared technology. Gamzee's influence in this situation is uncertain.

Doc Scratch also seems able to communicate with chat client users, despite using a typewriter, though has no handle, nor provides an alert message such as "X began pestering, trolling, bothering, jeering or cheering Y" when initiating contact, nor does he give an appropriate sign-off.