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<!--Insert this code in custom module layout.xml file.-->
<reference name = "head">
    <action method = "setTitle"><title>Accessory</title></action>
    <action method = "setKeywords"><title>module, keywords</title></action>
    <action method = "setDescription"><title>Module Description</title></action>
</reference>

//app/code/local/namespace/yourmodule/block/yourmodule.php
public function _prepareLayout() {        
    $head = $this->getLayout()->getBlock('head');
    $head->setTitle("Your Title");
    $head->setKeywords("your, keywords, anything");
    $head->setDescription("Your Description");
    return parent::_prepareLayout();
}