I need to look into this for you. I need to look into the customized help support in Office and I'll get back to you.
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No InfoPath is not required. It just helps you build more sophisticated forms for the workflows.
You can build workflows without SharePoint Designer, you can build them in Visual Studio too. The workflow in Office SharePoint Server is based on Windows Workflow Foundation. Check out
for some more info.
Sorry I took so long to get back to you. Glad you found it.
Great question era. You can use InfoPath to add forms to each step in the workflow process. These forms can be accessed from the browser or in e-mail as part of the workflow.