Since it's 2020, there is of course 9 extra years of tech advancement to take into consideration. Now, I'm not going to pretend that I know where the next 9 years are going to take us, so it's best to simply allow for a little bit of stylization.
Some things that have been referenced thus far are:
-Shallow-projection. Holographic projectors work, and work very well, but they're expensive, and so for at-home holographics, people generally have shallow-projection, which is a hologram projected in a layer about an inch thick from a screen not unlike a flatscreen TV. Not all TV channels or websites are SP-enabled, but movies since 2017 generally are, and video game consoles since 2020 follow suit.
-Terminals. Distinguished from PCs, terminals are single-unit communications computers meant for use at home. For VOIP, vidphone, TV, fast receive-and-print of documentation, e-mails, etcetera. Their core and peripherals tend to be one unit, though they can route any communications to anything else, bluetooth-style, and are usually used to route TV signals to another, larger screen. Usually they also act as a router and/or modem.
-Info kiosks. In some areas, cheap information kiosks are worthwhile. They can respond to general queries, provide directions to nearly any service or location, and so on. They're generally tied to a city database so have maps, phonebook information, can be used to place calls (for a dollar or equivalent), they can show the location of that next bus and when it will be arriving at the stop you're going to, general bulletins... The nickname for them in some places is "google-box", and their primary source of revenue seems to be sidebar ads, usually personalized to the queries made.
An overview of firearms technology:
Out of realm, the progress of guns has produced increasingly reliable and novel concepts both, as microelectronics and optics get more and more sophisticated. However, inrealm the concepts are rather more limited.
- Air guns: Simple .22 and .177 calibre weapons that don't require any propellant, mostly good for shooting small game or the neighbor's kids. These pose minimal threat, and are widely available.
However, full scale long air-rifles which feed from a back-mounted or dolly-mounted air tank are also available, though difficult to acquire. These are primarily the domain of militaries which are prepared for in-realm incursions, should the need arise. Though it isn't unheard of for scaled-up versions to be used aboard ships or other vehicles for defense. The end effect is usually a stationary-mounted automatic or semi-automatic weapon. The liability of the weapon is its dependance on pressure and its short range. Even the best units with the largest air tanks get a limited number of shots and an effective range of 150 to 200 metres. This is best employed as an AA weapon, since ship-to-ship engagements typically involve heavier weaponry.
- Spring rifles: These are more or less harpoon launchers that walk like a rifle. They are almost always cranked to reload, as their powerful springs require significant force to cock. Their projectiles range from standard crossbow bolts to large-calibre bullets. Their reload times are inevitably slow, and they tend to be quite heavy. The advantage is that anyone with standard rifle proficiency can aim one effectively. Inevitably, their recoil is also quite nasty. Spring pistols, despite the claims of their manufacturers, have a very difficult time yielding any lethality at all.
- Flamethrowers: These exist, though much like automatic air rifles, they are primarily the purview of militaries and the very heaviest of mercenaries with the contacts to procure them. Again, they have a habit of being very useful for ship to ship combat.
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