set-process-filter-multibyte

set-process-filter-multibyte is a built-in function in `C source code'.

(set-process-filter-multibyte PROCESS FLAG)

This function is obsolete since 23.1.

Set multibyteness of the strings given to PROCESS's filter.
If FLAG is non-nil, the filter is given multibyte strings.
If FLAG is nil, the filter is given unibyte strings. In this case,
all character code conversion except for end-of-line conversion is
suppressed.