Please give me idea about what is exact fuctionality behind the any software testing tool's add-in.

Quick test professional says:
Enables you to do functional testing of
Enables you to do functional testing of
Web applications built in HTML or XML, running within Internet Explorer, Netscape, or AOL
Win32 / MFC applications
Visual Basic
PeopleSoft 8.0 8.8
European Languages (Iso-Latin-1, ASCII)
Asian Double-byte Languages Chinese (Big5, GB), Japanese, Korean

Suppose if user is not going for any specified Add-in?

Without java add-in, i can not do functional testing of any jsp page? Please clarify?

Thank you