status.i4.v = dio_longest_device_document_comment(length.i4.r)

	This routine returns the length of the longest device
	document comment.

	length		length of longest device document comment

	This function returns ACNET status values as follows:

	OK			success
	SQL_xxx			error retrieving longest comment length

	This function requires the following include files:

	diolib_h, acnet_errors_h

	Related functions:

	dio_documentation_info_c, dio_obsolete_info_c,
	dio_longest_device_obsolete_comment, dio_audit_info_c,
	dio_edit_comment_info_c dio_longest_device_edit_comment

	C/C++ usage:

	int	status;
	int	length;

	status = dio_longest_device_document_comment(&length);