+ * verification/use (although session-based tokens
+ * are not stored in user preferences).
+ *
+ * NOTE: By default SquirrelMail will use a single session-based
+ * token, but if desired, user tokens can have expiration
+ * dates associated with them and become invalid even during
+ * the same login session. When in that mode, the note
+ * immediately below applies, otherwise it is irrelevant.
+ * To enable that mode, the administrator must add the
+ * following to config/config_local.php:
+ * $use_expiring_security_tokens = TRUE;