security at Hogwarts (potential spoiler)

[echomyst]

Original Yahoo! HPFG Header:
No: HPFGUIDX C4827
From: echomyst
Subject: security at Hogwarts (potential spoiler)
Date: 7/21/00 9:24 pm  (ET)

Not sure if anyone else has already addressed this...

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When Sirius visited Harry at Hogwarts in GoF, did he use Floo powder
(p.290)? I thought anything similar to apparation is not possible?
Or did he arrive at Harry's dorm through some secret passage?

Emily