SAP Workflow

Hi, I need to understand if SAP workflow can be created for invoice approval - PO and NON PO and few specific question below:

1. Once invoice is sent for an approval, is it possible to send auto notification to approver in his / her e-mail box ?

2. Is it possible for an approver to either approve / reject an invoice from the link given in e-mail box ?

If yes, how to do this and any specific version of SAP is required

Thanks,

Ajay