# Transfer parameters and return values

## Notice

Transfer parameters and return values are treated as streams.

## Additional information

- “Number of variable elements” function
- “Variable description by index” function
- “Variable handle by name” function
- “Read variable value by handle” function
- “Read variable value by name” function
- “Write variable value by handle” function
- “Write variable value by name” function
- “Extended description by index” function
- “Variable handle by name” axis-specific function
- “Read variable value by name” axis-specific function
- “Write variable value by name” axis-specific function