Agelong Tree 6 allows to work with a data file in shared mode.
The data file .at5 (and its documents folder) has to be saved in a cloud storage and be available on a local disk in a folder that is synchronized with this storage. To use this feature, one need to install a special cloud storage client program on users' computers.

When one user opens a data file .at5, a special service file is created in the folder where this data file is located. This service file indicates that the data file is already being edited. If another user opens the same data file in Agelong Tree, the data will be read-only. The first user needs to close Agelong Tree on order to allow the other user to edit the tree.