Q: Can I use ICQ Status to check whether a UIN is invisible or not?
A: No.

Q: What status will ICQ Status return?
A: Online and offline only.

Q: Does ICQ Status support proxies?
A: Yes. Right click on the main window to set proxies.

Q: Why does ICQ Status always return "Unknown" as the status?
A: Because the status of that particular UIN cannot be obtained.