Windows XP is full of many KEY-Combo Shortcuts to access Feasures quickly. Here are some of the shortcuts you may find most useful.

WINKEY + E =
Opens explorer windows with the folder sidebar enabled

WINKEY + PAUSE/BREAK =
Opens "system propertieS"

SHIFT + DELETE =
Delete a file without sending to Recycler first (NO RECOVERY!)

F5 =
Refresh (Usefull in Internet Explorer)

SHIFT F5 =
Reload Webpage from scratch (NO CACHE)

CTRL + SHIFT + END =
Highlight everything down a Text page from current possition (USE HOME for up)

ALT + CTRL + DEL =
Ahh, an old favorite. If an App. is being rude, use this to bring the the "Task Manager" (and kill it if you want). There is some other toys here too like, priorities you can set.

Search "Shortcut keys" under "HELP & SUPPORT" for a complete list of Shortcuts, including these.