Hey,

is it possible with the Cry Engine to work as a team?
Lets have 3 Pcs in the same Network, and one server (where all data like objects are saved).
But hov can 3 People on 3 Pcs work on one Map?

Use source control (git, perforce etc...) and work with layers in the Sandbox Editor :
http://docs.cryengine.com/display/SDKDOC2/Using+Layers