Submit a job (batch of jobs?) to pre-layout a track on lots of different zoom levels. Ping me when done
Rules to make individual tiles once layout is complete...
Less sure about this one now:
Submit a "classic GBrowse" page rendering job. Specify co-ordinates, zoom level, tracks, everything. Acknowledge that job is pending; give me a callback when job is finished
Allow me to check the job status (pending/running/done/etc) or modify/delete the job parameters while it is pending