| Reader | Sifflet.UI.GtkUtil, Sifflet.UI |
| Rectangle |
| 1 (Type/Class) | Sifflet.UI.LittleGtk, Sifflet.UI |
| 2 (Data Constructor) | Sifflet.UI.LittleGtk, Sifflet.UI |
| removeWindow | Sifflet.UI.Workspace, Sifflet.UI |
| renderWithDrawable | Sifflet.UI.LittleGtk, Sifflet.UI |
| Repr | Sifflet.Text.Repr, Sifflet.Data.Tree |
| repr | Sifflet.Text.Repr, Sifflet.Data.Tree |
| reprl | Sifflet.Text.Repr, Sifflet.Data.Tree |
| reprList | Sifflet.Text.Repr, Sifflet.Data.Tree |
| reprs | Sifflet.Text.Repr, Sifflet.Data.Tree |
| Requisition |
| 1 (Data Constructor) | Sifflet.UI.LittleGtk, Sifflet.UI |
| 2 (Type/Class) | Sifflet.UI.LittleGtk, Sifflet.UI |
| resizeFrame | Sifflet.UI.Frame, Sifflet.UI |
| ResponseAccept | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseApply | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseCancel | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseClose | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseDeleteEvent | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseHelp | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseId | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseNo | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseNone | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseOk | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseReject | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseUser | Sifflet.UI.LittleGtk, Sifflet.UI |
| ResponseYes | Sifflet.UI.LittleGtk, Sifflet.UI |
| ret | Sifflet.Foreign.Python |
| Rightbutton | Sifflet.UI.LittleGtk, Sifflet.UI |
| RightPtr | Sifflet.UI.LittleGtk, Sifflet.UI |
| RightSide | Sifflet.UI.LittleGtk, Sifflet.UI |
| RightTee | Sifflet.UI.LittleGtk, Sifflet.UI |
| rootLabel | Sifflet.Data.Tree |
| RPanel | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelAddRows | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelAddWidget | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelAddWidgets | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelContent | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelId | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelNewRow | Sifflet.UI.RPanel, Sifflet.UI |
| rpanelRoot | Sifflet.UI.RPanel, Sifflet.UI |
| RtlLogo | Sifflet.UI.LittleGtk, Sifflet.UI |
| runDialogM | Sifflet.UI.GtkUtil, Sifflet.UI |
| runDialogS | Sifflet.UI.GtkUtil, Sifflet.UI |
| runEntryDialog | Sifflet.UI.GtkUtil, Sifflet.UI |
