<p>Is there any security issue if let say in one application we do a hidden post to another application to make use of that application functionality?</p>

It's generated as formId:fieldId
So, if you had the following:
```
```
<h:form id="searchForm">
   <h:inputText id="searchField" ... />
</h:form>
```
```
The name (and HTML ID) of the search field would be:
searchForm:searchField