@this的功能到底是什么？

<p:commandButton process=\"@this\" ... />

<h:inputText ...>
  <f:ajax execute=\"@this\" ... />
</h:inputText>

<p:column>
    <p:commandLink 
        value=\"#{anggaranDetail.map[\'code\']}\"
        process=\"@this infoAnggaranForm:Anggaran\"
        update=\"detailDialogForm:Anggaran detailDialogForm:SubAnggaran\"  
        oncomplete=\"infoAnggaranDialog.hide()\" 
        image=\"ui-icon ui-icon-search\"
        action=\"#{tInputBean.updateAnggaranSubAnggaran}\">
        <f:setPropertyActionListener value=\"#{anggaranDetail}\"
            target=\"#{infoAnggaranBean.selectedAnggaranDetail}\" />
    </p:commandLink>
</p:column>

<dependency>
    <groupId>org.primefaces</groupId>
    <artifactId>primefaces</artifactId>
    <version>2.2.1</version>
</dependency>
<dependency>
    <groupId>com.sun.faces</groupId>
    <artifactId>jsf-api</artifactId>
    <version>2.0.4-b09</version>
    <scope>compile</scope>
</dependency>
<dependency>
    <groupId>com.sun.faces</groupId>
    <artifactId>jsf-impl</artifactId>
    <version>2.0.4-b09</version>
    <scope>compile</scope>
</dependency>