Use of non-printable characters in string field.

1.HI Guys,

This is regarding usage of non-printable characters.As per the requirement, in a text string field, a 'space' should have a non-printable representation in the description field to enable the user to visualize the requirements.That is, on pressing the space bar it should display a non-printable character which should only be visualised while entering or displaying data and should not appear in print-out.

This is little urgent so if you guys can help me on this.

Thanks.