I'm used to do
when I want the reference for a given symbol, then I click on the
>> arrows to open the help window.
Would it be possible to redefine the meaning of
?? in order to open the reference window directly ?
The simplest (and canonical) method is to place the keyboard cursor in the Symbol name, or select it with a double-click, and press F1 if you use Windows/Linux or Command-Shift-F if you use OS X. This will bring up the Help for that item. This also works with compound operators, e.g.
Nevertheless I like a challenge, therefore:
Now this brings up the Help page for
While this will search the documentation for the term "Fold":
The typical way to search the documentation is the keyboard shortcut Mr Wizard mentioned. In general, you can find the shortcut key for a command by looking in the menu ...
If you are looking for a built-in way to open a documentation pages using a built-in command, then you are looking for
will open the documentation centre and do a search for "euler". It returns a reference to the notebook window containing the search result. The behaviour equivalent to typing the search term into the documentation search box.