A short breakdown what the "Link:" field can / could be used for:

• "sage"
• "aa" (enforcing using of Mona Font on that post)
• E-mail (with corresponding mailto: link)
• Hyperlinks (with corresponding http:// link)
• Obfuscating session ID display (could be limited to work only with "sage")

Combinations should always be possible (Such as "sage" and "aa" in the same post).