The Checkpoint File Panel

The Checkpoint File panel

A "Checkpoint" file saves all commands and mouse actions during a D3PLOT session. It is deleted when the code terminates normally, but is left on disk if a crash, system failure or some other abnormal termination occurs.

If you see the checkpoint file panel when the code starts this means that a previous D3PLOT run has crashed, and recovery is possible.

Checkpoint files are described in Checkpoint Files