Share Layer
From GapWiki
To share a layer select it and click Share. The following window will appear (Figure 1):
Public
To share a layer with all GAP users, select the layer and press share button. If the layer is already shared, you can unshare it by pressing Un-Share button
User
To share/un-share a layer with specific user start typing the name of the user in the text box, and then select the user from the suggested users.
Group
To share/un-share a layer with a certain community/group select the community from the drop down list.