The general form for entering Explorer commands from the console is

Explorer [/n][/e][,/root,<path or UNC>][[,/select],<object>] 

where:

/n opens Explorer with object view only;

/e opens Explorer with tree view and object view at the current folder;

/root,<path or UNC> opens Explorer at the specified root level;

/select,<object> specifies which object (a file, folder or volume) gets the focus. The select parameter may not work in certain IE4 installations.

Some "stupid" Explorer tricks:

Explorer ..

will open Explorer one directory above the current directory.

Explorer 

will open Explorer at the root directory (usally C:\\).

Note that most of these commands also apply to Shortcuts and the Run dialog as well. One Explorer command that works only in the Run dialog consists of a single period ("."). The "period command" is the same as Explorer \\.