Protocol used while Saving/Opening file from SkyDrive in MS Office

Hello,

When we Open/Save file fom SkyDrive in Office  we have 2 possibilities -

1. We have SkyDrive installed on my Computer -

File is open/save from local SkyDrive folder and synched with online account using MS-FSSHTTP protocol.



2. But If We don’t have SkyDrive Window App installed on our System -  

Now if i want to open file from SkyDrive and then edit save it . 
HOW IT IS MANAGED ?
IS IT DONE USING WebDAV protocol ? if Not, then how it is managed ?

Thanks in Advance...