Illegal Entry Message. Enter the letter w (or any other letter) in the BODY HEIGHT field, then move the cursor out of the field, or press the Tab key (to move the cursor to the next field). Notice that upon leaving the BODY HEIGHT field a Dialog Box appears with the following message: Please enter a Body Height number... Notice that the letter "w" is erased and the cursor remains in the Body Height field. If the cursor is moved out of the field again without entering anything, a second Dialog Box appears with the values and limits accepted for that particular field -parameter-, both units are included. back | Notice: This is the actual IBW calculator in the program.