hurvl: I haven't played Deus Ex in a long while, but hacking is quite fun, letting you switch off security or turn it against enemies. It's one of my favorite games and Deus Ex-like games are my favorite genre, so I want you to enjoy it as well.
I found this link which might help you
https://www.gamespot.com/forums/pc-mac-linux-society-1000004/how-to-hack-computers-in-deus-ex-27404029/ . Also, here is the wiki page for hacking in Deus Ex
http://deusex.wikia.com/wiki/Computer_skill timppu: Thanks, that clarified it a bit. I got a bit mixed up with "hacking" and "computer" skills. So if I understood right:
Hacking needs no extra tools, just the skill. You can hack ATMs, computers and such. Hacking is optional, the other option is to find some valid login username/password and use them (and then you don't have the time limit either as you do if you hack).
Computer does need a tool, a multitool. So the reason I wasn't able to switch off the laser beams from the control panel was apparently because I didn't have any multitool anymore. Multitools work only once per tool, and you can carry max 20 multitools with you.
Lockpicking also needs a tool, lockpicks, and they are one-time use as well.
Now the only remaining question is, where does one get more multitools and lockpicks? Do you buy them somewhere or just find them lying around?
Yeah, you've understood it correctly.
I've only found multitools and lockpicks lying around or in crates, never heard of anyone selling them.