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Is it possible to retain priority when responding to something?

Example:

Opponent casts a spell.
I want to counter it but need to crack a fetch for the right mana.
After I crack the fetch the stack resolves without an opportunity to counter the spell.

Sorry if this is a basic key press or something. Thanks!

Hi,
This is one of the major limitations of Manalink. When this game first came out in 1997 timing worked a lot differently; the stack didn't exist yet, all counterspells were "faster" than instants, and spells resolved in "batches" instead. That is what you are experiencing when the "stack" (really, a "batch") resolves without an opportunity to intervene.