Whenever a preferred project (temporarily) runs out of work or the specific feeder is off line, the work fetch policy checks if other preferred projects have tasks available. If that is not the case, the next step is to see if the device profile has the alternate work option selected. If so, the project servers will look if they can send replacement work as to prevent that the volunteer device/devices end up being idle. To opt in for alternate work, visit your My Grid → My Projects page where the following section with choices is available: