Icy Phoenix

Well, some days ago I realized that ¡We can set several fonts (kind of letters)! So, I'm wondering how can we add them to the expanding folder "Font" of the "Posting box", and how to set the default font. Furthermore, I'm also wondering if doing that won't cause conflicts to the users who haven't these fonts installed on their computers, or maybe if we have to install them on the server (yes, I'm quite ignorant about these things), or maybe we have only to copy the Font file in a magic folder and that's all, or what else! I don't know...

Hope I meant well Thanks in advance for your attention.