TLDR – The Add-SPShellAdmin and SPWebApplication.GrantAccessToProcessIdentity are very similar in what they do, but there are a few key differences: Add-SPShellAdmin: Should be used for granting admin accounts access to...
Many of you have probably read that Office Web Apps Server 2013 has moved from the Download Center to the Volume Licensing Service Center(VLSC) from here (Evaluation availability is still available on MSDN for subscribers ):
Recently I went to the VLSC site (https://www.microsoft.com/Licensing/servicecenter/default.aspx) and did a search for Office Web Apps..no results. I did a search for Web Apps..no results. After calling the VSLC phone number they indicated that the Office Web Apps Server 2013 install is located under the Office Professional Plus 2013 (and Office Professional Plus W/ SP1) download.
Just another day in the life..