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I noticed today that after a sequence such as: 1♠ (p) 2♣ (2♦) ? the opener's call of pass/double/cue and any modifications to other calls are undiscussed. What are the expert recommendations here, given that without interference 2N would be 12-14, 3♣/♦ would be natural with extras, 2♠ would be 5+ and 3♠ 6+ solid or equivalent. Thanks. [EDIT: should have added that the 2♣ GF is semi-artificial (may not be clubs) whereas the other GF 2/1 responses guarantee 5 cards always.]

Not an expert but if 2/1 is GF (as we play) then the opponents don't "turn off" our GF by overcalling. Therefore, in our simple 2/1 system, pass by opener is forcing. In this example, if opener would have rebid 2♦ or perhaps rebid 2NT but lacks a ♦ stopper, then he can pass but responder is expected to bid again. A double by opener is for penalty; a cuebid shows support for responder's suit and slam interest. Other bids are natural and still GF. I agree that this doesn't seem to come up very often.

Either player can edit the card once it's been shared. Just do take care that you're not both trying to edit at the same time. Otherwise, one person's edits may overwrite the other's. I find it works best when you're on the phone together, and one person is making all the (agreed) changes.

There are lots of different options here. The overcall (and only a single step too!) has given your partnership much more bidding space than before. It is up to your partnership to decide whether you want to keep things simple, or try to make optimal use of the available space, or something in between. Generally these overcalls are rare (because they are very risky after our side has claimed ~24+ HCP, and usually help declarer more than they help the defenders). I think the very simplest agreement you could make (but far from best) is Double = 'stolen bid' = I was going to bid 2♦ = penalty, showing 4(+). Anything else = as before. Pass = 'Partner I am so sorry I opened' - minimum that got worse on the auction. Personally I prefer to try to exploit the available space more. The rule is "Look at your hand, if you have something important to say, say it. If not, pass." This becomes Pass = any generic minimum, usually balanced (I think it is even better to play this as any balanced hand). Double = Takeout (but you can play penalties if you prefer) - redundant on this auction, but important to show heart shortness if they overcall 2♥, as an example. 2♥ = Nat, 4(+) hearts, but we are allowed to take a view with e.g. a soft 5=4=3=1 and pass. 2♠ = 6(+). 2NT = 18+ balanced (12-14 passes or bids T/O with 5=3=2=3). 3♣ = 5(+) (but my 2♣ is artificial). If 2♣ promises at least 4 then bidding this on 4 is also fine, though it probably only comes up if you are 5=2=2=4 or 5=1=3=4. Having established a game force, your goal should be to get to the best game. Usually that means 3NT, 4♠ or 4♥. So I think, having already shown spades, you should either show extra spades, show hearts, show extreme shape or get out of the way. I would not at all be surprised to learn that better players than me use tools like pass/double inversions or artificiality to double the number of sequences starting after the overcall.

What is it called? Certain convention cards appear under "Stock Cards" and represent ACBL SAYC, 2/1, and Acol systems. You might also have a "Your Favorite Convention Card" under Personal Cards; I recommend you keep that card filled out with a simple version of your preferred system card, so you can offer it to a new or pickup partner and have a basic understanding between the two of you.

When you first set up a card to use with your partner you can type in their BBO name at the top where it says "partner". Now when you play together this card is loaded for ops to look at (if they want). It also means that the card is available in your partners account to look at, change and save.