switch-to-prolog
switch-to-prolog is an alias for `run-prolog' in `prolog.el
'.
(switch-to-prolog ARG)
This function is obsolete since 24.1;
use `run-prolog' instead.
Run an inferior Prolog process, input and output via buffer *prolog*.
With prefix argument ARG, restart the Prolog process if running before.