1. A method comprising: receiving, via an active address field, a character string comprising one or more characters, repeatedly checking validity by repeatedly requesting information on the validity of said character string as a document identifier, wherein the checking is implemented by the active address field receiving the character string, causing indication of a valid part of said character string comprising at least a domain part, causing indication of the validity of said character string as a whole by causing an appearance of a control element to change, wherein the control element is configured to cause a request for a document relating to the document identifier defined by said character string to be sent in response to selection of the control element by a user and wherein the control element does not include an indication of the document identifier defined by said character string; and causing an offering of a possibility to send a request for a document relating to the document identifier defined at least by the valid part of the character string and ignoring any other part of said character string.
1. A method comprising: receiving, via an active address field, a character string comprising one or more characters, repeatedly checking validity by repeatedly requesting information on the validity of said character string as a document identifier, wherein the checking is implemented by the active address field receiving the character string, causing indication of a valid part of said character string comprising at least a domain part, causing indication of the validity of said character string as a whole by causing an appearance of a control element to change, wherein the control element is configured to cause a request for a document relating to the document identifier defined by said character string to be sent in response to selection of the control element by a user and wherein the control element does not include an indication of the document identifier defined by said character string; and causing an offering of a possibility to send a request for a document relating to the document identifier defined at least by the valid part of the character string and ignoring any other part of said character string. 2. The method according to claim 1 , wherein causing the appearance of the control element to change comprises causing the control element to change from a first color to a second color.