Question: I have created a Leave Authorisation Form using Infopath 2010 and published it to Forms Library. I have also created a SharePoint designer 2010 custom approval workflow and published it to forms library. 

User opens the leave form in browser and fills the info and submits the form and workflow is initiated and manager receives a email. Until here its fine.

When the manager opens the Infopath form how can I provide him an option of approving or rejecting the form that will invoke the workflow. I don't want manager to browse the forms library and then selecting the item from the List and then starting the approval workflow.

Is it possible to customise the InfoPath without any custom code?

Answer: 
You will need to configure the search box from the Site Collection > Site Settings > Search Settings page. Enable *Custom Scopes* and select the dropdown mode *Do not show scopes dropdown, and default to target results page*. These settings are, however, only available with SharePoint Server search features enabled on the site collection.
If *sharepoint* the name of your application pool you could try to add the url to access mappings.