r-cran-g.data - 2.4-4 main

g.data creates and maintains delayed-data packages (DDP's). Data
stored in a DDP are available on demand, but do not take up memory
until requested. You attach a DDP with g.data.attach(), then read from
it and assign to it in a manner similar to S-Plus, except that you must
run g.data.save() to actually commit to disk.