Yes
Well, probably yes or not in the traditional sense, the hacking puzzles in Half Life Alyx is probably for the player to see, and to Alyx is just moving the EMP/Multitool in different angles and timing, but considering the HL1 training has holograms too, I suspect that this is not the case
The hologram-like stuff we see in HL2 appears between 2 equipment, not holograms like the the usual Sci-Fi when it appears in mid air from a device.
4
I imagine they have something like it. Though I picture it as less like a 3D projection and more of a generic 2D sci-fi "holoscreen".
Yes Well, probably yes or not in the traditional sense, the hacking puzzles in Half Life Alyx is probably for the player to see, and to Alyx is just moving the EMP/Multitool in different angles and timing, but considering the HL1 training has holograms too, I suspect that this is not the case The hologram-like stuff we see in HL2 appears between 2 equipment, not holograms like the the usual Sci-Fi when it appears in mid air from a device.