| Feature/Function | API Used | Programming Language |
| Editor | Carbon | C/C++ |
| Screen display | Carbon | C/C++ |
| FTP transfer | Carbon | C/C++ |
| OSA scripting | Carbon | C/C++ |
| Webkit framework | Cocoa | Objective-C/Objective-C++ |
| Spelling framework | Cocoa | Objective-C/Objective-C++ |
| SFTP | POSIX | C/C++ |
| Authentication | POSIX | C/C++ |
| UNIX scripting | POSIX | C/C++ |