- * read_context - 0: don't read context
- * - 1: read context, check nmh version, and issue warning message
- * if non-existent or old
- * - 2: read context, don't check nmh version
+ * read_context - whether to read the context
+ * check_version - if read_context, whether to check the version, and issue warning message if non-existent or old