HC, short for Hypocopping, is where players list who they would have targeted if they had been the cop and what result they got. This is done so that cops can list their results without being targeted for Night Kill, so that if they die we know who they checked. For this reason, we want players to select their HC target as realistically as possible, who they would actually have targeted if they'd been the cop, meaning a dead player might well be copped, similarly players should try to avoid selecting HC targets who would be improbable choices. Players should therefore not select their HC target randomly, however they should select their results randomly. From the perspective of a veteran scummer, without instruction players tend to list guilty far more often then is statistically probable, and the scum generally know who is innocent or guilty, and can thus eliminate someone as a cop for a wrong answer they give since the cop must answer truthfully or essentially sabotage the results and likely get townies killed and generate anti-town confusion. Every player the scum can eliminate as cop is one less person they need to consider in their hunt, and each wrong or improbable result helps narrow things down, as cops rarely make truly random choices but select from a pool. To protect the cop, players need to primarily 'huddle' around high-probability choices and produce as many true responses as probable, to hinder the cop hunt.

Now, if you are a role other than cop, it is often advantageous to leave a record of what you did as well. Docs and vigs should not generally not do this, nor should any "Passive" role or roles which do not target players, such as Bulletproof. Generally, a player doing this should list their target as their HC, and pick the less likely result as guilty, and use the more likely result or an ambigous one as not guilty, so a tracker who tracks someone and gets no result would HC that person as not guilty, but if they got a result, as guilty. Or roleblocker primarily just needs to list who they targeted, and can list guilty if they got back a definite hit saying that player had an action blocked. A role-detector should list someone guilty if they get a role (unless they know they are in a role heavy game in which case they may want to go the other way, the important thing is consistency). While the current probability is we are low on roles and they are fairly standard, if you are roled and have a non vig/doc power that targets people (e.g. Tracker, Watcher, Role Blocker etc) you should make up your mind if you are going to use the HC table to report this - I strongly encourage people to do so - and then to do it consistently, above all else, don't leave a confusing trail by doing it half the days or changing your method, like RBing people as not guilty if they did nothing then changing half way through the game to 'guilty' if they did nothing.

Let me also add that many of us consider it very anti-town to use the table to 'save your own neck' by doing something that strongly indicates you aren't the cop, a good player tries to come off as a possible cop, because they realize that taking a proverbial bullet for the team helps.