To replace the zen banner with your own logo you need to replace the logo in Admin > Images > Logo.gif with your own image. Then change the file name or dimensions in Admin > Includes > Languages > English.php
Code:
// added defines for header alt and text
define('HEADER_ALT_TEXT', 'Admin Powered by Zen Cart :: The Art of E-Commerce');
define('HEADER_LOGO_WIDTH', '200px');
define('HEADER_LOGO_HEIGHT', '70px');
define('HEADER_LOGO_IMAGE', 'YOUR_IMAGE_NAME.jpg');
As to your second question, I don't know what you are asking...
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