There are various Gurmukhi Fonts that are used on the web in html, or in pdf or word  documents etc.  These font files are in TTF (True Type Format) and can be used on Windows, Linux or MAC etc. desktops.

This beautiful collection of fonts is made by Dr. Kulbir S. Thind and are hosted by Sikhnet on their site. The fonts can downloaded individually as a zip file and then installed on the computer. Also a Gurmuki Keyboard Map along with a Font Manual is also available for download to help understanding the font and Gurmukhi Key layout. Windows and Mac instructions are also provided in the Sikhnet site. For Linux/Unix Font install instructions you can read this post. 

 Click here to go to Sikhnet Font Download Page.

For reading the Hukamnama on JustSikh Site, please click the following link to download the Hukamnama font for windows. It is an executable file, just download and double click on it to launch the installer. It will automatically install the required fonts. Alternatively you can download the TTF Hukamnama font directly from here. Install it on windows (copy to fonts folder via Control Panel) or linux (copy to home directory and reload font cache).

Once done , restart your browser to view the Humkamnama correctly.