FastLane has been the National Science Foundation's (NSF's) electronic proposal submission and award management system, and to date users have needed a user ID to access. They used to obtain that ID from ORSP.
Beginning, March 26, 2018, new users will be able to register directly through Research.gov. (Note that this link will not work until March 26, 2018.)
Existing users in Fastlane will be migrated to the new system through a simple, one-time operation when signing in to FastLane or Research.gov after the new functionality is released.