how to write an interactive crm program?

i'm using crm114 to topically classify articles from a newspaper corpus
gathered from the web over the past 10 years.

the articles live in large files that contain all the material from several
different newspapers for a single day.

my crm program goes through the file, finds each article, and classifies it.
up to this point, everything works.

this is where my problem comes in: i'm trying to make the process
interactive, so that i can tell the program whether it classified each
article correctly. to do that, i have written the following function (please
excuse gmail's lack of indentation):

:interact: {
{
    isolate (:user-feedback:)
    syscall () (:user-feedback:) /crm interact.crm/
    match (:incorrect:) [:user-feedback:] /w/    # 'w' for wrong
    output /The piece was NOT classified correctly; you input
':*:incorrect:'\n/
    # here is where the DSTTTR stuff will eventually go
    return
}
output /The piece was classified correctly\n/
return
}

the syscall calls the following crm program:

{
    isolate (:user-input:)
    output /:*:user-input:/
}

i have tried various variations over this, but i haven't been able to get
anything back from the interact.crm program, since it doesn't stop and wait
for my input to populate the variable (:user-input:). this leads to the
interact function in the main program matching on an empty string - the
(:user-feedback:) variable.

the main program runs only when it gets an EOF, as it should, but the
interact.crm program doesn't seem to require an EOF. i was hoping it would
stop to wait for my input from the terminal (ended by an EOF) before it
continued.

i haven't been able to find anything on interactivity or user input from the
terminal in the documentation. crm seems very mail-oriented.

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