1. One or more computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: providing a first input mode that restricts display of an input into a text field to a first set of characters; causing display of one or more characters of the first set of characters within the text field in a first manner; providing a second input mode that restricts display of an input into the text field to a second set of characters that differs from the first set of characters; and causing display of one or more characters of the second set of characters within the text field in a second manner that differs from the first manner.
1. One or more computer-readable media storing computer-executable instructions that, when executed, cause one or more processors to perform acts comprising: providing a first input mode that restricts display of an input into a text field to a first set of characters; causing display of one or more characters of the first set of characters within the text field in a first manner; providing a second input mode that restricts display of an input into the text field to a second set of characters that differs from the first set of characters; and causing display of one or more characters of the second set of characters within the text field in a second manner that differs from the first manner. 3. One or more computer-readable media as recited in claim 1 , wherein the first set of characters and the second set of characters comprise mutually exclusive sets of characters.