Is the DPO4000 GPIB code compatible with the TDS3000B Series? Other TDS scopes?

Is the DPO4000 GPIB code compatible with the TDS3000B Series? Other TDS scopes?

Yes, whenever TDS scopes have the same feature/function as in the DPO4000 series, the related GPIB commands and formats are the same.  All instrument commands are listed in the respective programmers manual.