You do have to have Han fonts installed to see them, and most people don't (I certainly don't). The author seems to have gotten it right, though; I checked the Unicode specs and the characters shown are "Wu3" and "Shen1 Xia2", respectively, meaning roughly "military hero". There is an alternate character for "Xia2" (侠), but I don't know enough about Mandarin to know which is appropriate--I defer to the author on that. --LDC
If you are using MS Internet Explorer 5.0 or above, you can temporarily change the View/encoding to Traditional Chinese and Simplified Chinese. If your MSIE lacks the required font, IE will ask you if you want to download the text display support pack. If you answer yes and select the download location as "internet", your browser is capable to display the font within minutes. You can repeat the process for Arabic, Korean, Hewbrew, Thai etc. until your browser can show all Unicode characters from all over the world. If you are using Netscape, then you are limited to one font at a time per page. In this case, switch to Traditional Chinese encoding and Netscape will display both characters in this article provided a Chinese font is made available to Netscape.
Go to Unicode and HTML page to test if your browser can display multi lingual text on the same page.