Selecting "manual entry of individualized code" automatically activates the "Yes" option for individualized invitations and the "Manual entry" option for code entry. Respondents will receive the same URL, and will initially need to enter their individual code manually. An invitation with a code can be sent to the respondent by email via the 1KA system. However, it can also be sent externally (outside the 1KA system): by letter by mail, by SMS in some other way; in such a case, the 1KA system merely records who, when and how sent the invitation.