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When AUCTeX runs a program, it creates an output buffer in which it displays the output of the command. If there is a syntactical error in your file, latex will not complete successfully. AUCTeX will tell you that, and you can get to the place where the first error occured by pressing C-c ` (the last character is a backtick). The view will be split in two windows, the output will be displayed in the lower buffer, and both buffers will be centered around the place where the error ocurred. You can then try to fix it in the document buffer, and use the same keystrokes to get to the next error. This procedure may be repeated until all errors have been dealt with. By pressing C-c C-w (TeX-toggle-debug-boxes) you can toggle whether AUCTeX should notify you of overfull and underfull boxes in addition to regular errors.

Issue M-x TeX-error-overview <RET> to see a nicely formatted list of all errors and warnings reported by the compiler.

If a command got stuck in a seemingly infinite loop, or you want to stop execution for other reasons, you can use C-c C-k (for “kill”). Similar to C-l, which centers the buffer you are in around your current position, C-c C-l centers the output buffer so that the last lines added at the bottom become visible.

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