CIMPLICITYO
| Object (data type) | |
| Objects (topic) | |
| Oct, Oct$ (functions) | |
| OKButton (statement) | |
| On Error (statement) | |
| Open (statement) | |
| OpenFilename$ (function) | |
| Operator Precedence (topic) | |
| Operator Precision(topic) | |
| Option Base (statement) | |
| Option Compare (statement) | |
| Option CStrings (statement) | |
| Option Default (statement) | |
| Option Explicit (statement) | |
| OptionButton (statement) | |
| OptionGroup (statement) | |
| Or (operator) |