I'm sure this has already been asked by others other places on the web but I can't seem to find a satisfactory answer due to how the wording is on this ability
If you have a drone, whenever both you and your drone make attacks against the same target, you each receive a +1 circumstance bonus to your attack rolls. If you have an exocortex instead, whenever you and your exocortex are both attempting to hack a system, you each receive a +1 circumstance bonus to the checks to gain access. In either case, these bonuses increase to +2 at 17th level.
Very specifically the wording of hack and gaining access. This heavily implies that you are both doing a full action against one computer to gain access. Because as it seems to me the other computer skills do not involve gaining access other than the hack system.
Also as I understand it having access means you don't need to hack to use a computers functions so that puts out access unsecured system because you aren't gaining access as you already can access it whenever