| attach_eval | Evaluate R expressions in an attached environment. |
| attach_source | Source R files into an attached environment |
| import_from | import objects |
| include | Source R files |
| set_library_default_pos | Modify default attach position for 'base::library()' |
| within.character | 'within' methods for R environments |
| within.environment | 'within' methods for R environments |