Not waiting on getchar() in the other window

You are in console (non-gui) Vim and have split the
window (:sp). In the upper window you launch a script
that calls getchar().
What I'd like to be able to do is while the upper
window script is waiting on getchar(), switch to the
lower window and have a normal editing session and, then,
when I want jump back to the upper window and enter
characters that will be returned to the script via
the getchar() call.
Is this possible?

Thanks
Richard

--
Quis custodiet ipsos custodes

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