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Just add Presentation Sync Extension to your Chrome. Open your Presentation and click the button "Sync Present" on the page.
1. Drag the following link to your bookmark toolbar: Presentation_Sync_Gadget.
Note:If you don't have a bookmark toolbar or can't drag it(on iPad for example), you can click the link and add a bookmark manually.
2. Open your google presentation file and click the bookmark.
3. Anyone else open the same file and cliked the bookmark will keep be synchronised with you.