I'm helping a friend move to Denver
Denver is not the same as the rest of Colorado ... there is an "Assault Weapon" ban in Denver that recently won a court challenge, so I expect that Denver will ban CCW there eventually (or at least return to a "May Issue" system ... however its unclear whether permits from other counties will be permitted there, I expect they will).
If possible (and if its not too late) make sure your friend doesn't live in Denver ... most of the suburbs around the city are less annoying than the city itself.
CCW in your vehicle is legal
without a permit here
and open carry is legal (but expect a hassle in Denver on both of those if you have a run in with one of Denver's Finest).
CCW in bars and restaurants that serve alcohol is legal ... you can drink while carrying but it is illegal to be "under the influence" while carrying (although the statute doesn't define "under the influence" ... most consider it to be the same as driving, but it's actually totally up to officer discretion). I have a "one drink without food, two drinks with food" rule that works well for me, but I also live down in the Springs which is much friendlier to CCW (El Paso County was "Shall Issue" while the state was officially "May Issue").
Which brings me to an interesting bit, there is no State CCW license, all licenses are issued by the counties (so mine is an El Paso County permit) so the permits look different all over the state (El Paso's is kinda plain).
There is no requirement to tell law enforcement you are carrying here (although its still a good idea to do so) and I don't believe that your status as a licensed carrier will show up on a traffic computer (but I'm not 100% sure on that ... again it may be a county by county thing).
Signage carries no special weight here ... unless the signage is accompanied by metal detectors and/or security checking bags and patting people down (so some clubs you will not be allowed into).
There is no "printing = brandishing" stupidity here either ... since open carry is legal statewide its a non issue.
As for Denver, there is a legal concept here called "Home Rule" which Denver is trying to use to set up different laws than the rest of the state ... its a battle thats been going on for a while and maybe one of the other Coloradoans can explain it to you, but basically Denver wants to be
"Chicago of the Rockies", gun bans and corruption and all.
At any rate, I still think Colorado CCW laws are better than Texas.