iframe - Display more data in an HTML/ASP page without refreshing the page -

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i've seen other sites it, i'm not sure it's called or begin...

i want more content displayed on page, without having refresh (via browser refresh button or meta refresh tag on page).

currently page html / classic asp , writes out data text file on server. text file being populated data command-line tool running on server (that's way, can't touch/redesign/re-code this). have .asp page when refreshed, uses realline method write what's in text file, , refresh .asp page in iframe every 3 seconds until last line appears (which know in advance) , when string found take away meta refresh cause i'm "done" displaying more info.

what do, avoiding java (many won't have installed) or javascript (i suspect users have disabled), load page , have fill in more information text file appears. possible? how/what's called? appreciate code samples if available.


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