There's the technology today to produce most of the comedies seen in star trek, not just the original series. I'm talking the TNG or DS9. The automatic sliding doors are seen in almost every supermarket. You would install them with steel or aluminum doors with the design seen on the shows. Come badges could be produced. The only problem would be wearing a cellphone sized device somewhere on your body. The hypo spray could be developed with our technology, we use syringes more often. The technology in hyposprays was used in mass vachination machines. I'm sure it could be miniaturized. Isolinear chips compare to memory sicks or SD cards of today. One could install touchscreen monitors throughout one's house linked to a central computer. Microphones and speaker hidden throughout the house could provide the voice access like seen in star trek. Al though you might want to upgrade their authorization code method. It's horribly insecure. A PADD could be a tablet pc or kindle. It uses induction charging, something that could be incorporated or built in using today's technology. The "laptop" used in readyrooms could be a laptop. The facebook video message system shows how the star trek messages could be transferred. Skype could be used as transmissions. A giant monitor could serve as a view screen. A replicator is hard to do with today's technology, but we have machines that can produce drinks. We don't have phasers, but current day guns are as good as them in stopping power, and they can't be damped by damping fields. Torpedoes in Star Trek are just like air to air missiles in the sky or normal torpedoes in the sea. Jefferies tubes could be installed in one's home if you wanted it to. Next are somethings that aren't as good as the ones in star trek. Our medical technology isn't as advanced. Tricorders could be iphones modified a bit with radar and other technology. They wouldn't be the same quality as the ones in star trek. A holodeck could be simulated with virtual reality machines, movie theater, video games, and a 3-d holographic projector. They would be most of the uses a holodeck is used for. There are somethings we don't have that is seen frequently in star trek. Transporters and Warp Drive are chief among them. In some ways though, we have surpassed the technology seen in star trek. Touchscreens are a prime example. Instead of the unchangeable interfaces we see in the bridge, we could put touch screens in all of the consoles.