novice question re "marked" and customkeys

[Timothy Miller]

Hey dudes,

The "marked" property is so easy to use. "go next marked" and "unmark all cards" are so fast and foolproof! Very handy.

I'm wondering if I can somehow define my own versions of "marked"

E.g., in a hypothetical stack, the "marked" of cards 3, 10, 22 and 99 is "true"

I somehow define my own properties, like "barked" and "darked"

In the same hypothetical stack, the "barked" of cards 1,2, 3 and 4 is "true"

the "darked" of cards 2,4,6,8 and 99 is "true"

Somehow I could "go next barked" or "go next darked" just as fast and easy as I could "go next marked"

In this perfect world, I could "unbark" or "undark" all cards as easily as I could unmark them.

I suspect this isn't really possible. I suspect the closest equivalent would be to use customkeys and repeat loops, to find the next card with a certain value of a certain customkey, and so on. I suspect this would be somewhat slower than "go next marked" or "unmark all"

The marked of a card resembles a customkey, but I suspect it works differently. True?

Is it possible to "go next" to a card with a certain value of a certain customKey? Or is it necessary to use a repeat loop to inspect the each card until I encounter the customKey and value I want?

Is it possible to "set the poodleNose of all cards to empty"? I suspect not.

Am I getting this right? Am I missing anything important?

Thanks in advance,

Tim