how to compare regions of 2 buffers

[Roland Reichenberg]

Hi NG,

I have two buffers A and B. Both more than 2000 lines. One part (lines
500-1000) of both buffers are almost identical. But not exacly identical. I
want to find out the differences between the two 500-lines-regions.

In the emacs online help I have only found
- highlight-compare-with-file
-compare-windows

But I need a function that compares only one marked region in buffer A with
another marked region in buffer B. Something like "compare-region"

What can I do?

Thanks in advance,

        Roland