How to get the birthday present in Guild Wars

You have to add some command line arguments to Gw.exe when you start the game up.

The two that you need to add are -email, -character, and -password. Have a look at this link for more complete details:

http://wiki.guildwars.com/wiki/Command_line_arguments

From the link:

Instead of using the command line, you can execute switches directly from your Guild Wars shortcut:
1. Right click on your Guild Wars shortcut and select 'Properties'.
2. In the 'Target Area' field you will see the location of your Guild Wars executable file: "<...>\Guild Wars\Gw.exe"
3. Write the desired command line arguments after the quote marks, each beginning with a space: "<...>\Guild Wars\Gw.exe" -perf -windowed

Thanks to the answer to this question, I was successfully able to use AutoHotKey to map the mouse right-click to a key on the keyboard, which gives me the ability to control the camera in the game.

(However, I have also asked a new question, regarding whether or not using software like AutoHotKey violates the Guild Wars Terms of Service.)