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Function Builder and ABAP Editor 
· Programming function modules using the Function Builder (transaction SE37)
· Creating programs and reports using the ABAP Editor (Transaction SE38)
...
1. Call the Function Builder as follows:
Transaction Code |
SE37 |
2. Enter the required data on the initial screen of the Function Builder. You can display and change existing function modules, or create new function modules.

...
1. Call the ABAP Editor as follows:
Transaction Code |
SE38 |
2. Enter the required data on the initial screen of the ABAP Editor. You can display and change existing programs, or create new programs. You can also choose from a range of subobjects, such as variants or documentation.

You can now create or modify function modules and programs and use them with qRFC.
See also the section about qRFC API.