The I/O Terminal tool can offer functions that normally would normally require the ECU to be opened and a BDM programmer connected, however it can accomplish these procedures over K-line/CAN and in some cases all from OBD!
It also supports some tricky controllers which are not covered by other tools.
Using this tool you gain full control of the ECU's memories.
You can read/write eeprom and internal/external flash memories (where available)