| More docs on the ARB website. See also index of helppages. Last update on 22. May 2026 .

Main topics: ARB: a Short Introduction Glossary | Related topics: SELECT MODE MARK MODE GROUP MODE ZOOM MODE LOGICAL ZOOM MODE INFO MODE WWW MODE LINE MODE ROTATE MODE SPREAD MODE SWAP MODE LENGTH and MULTIFURC MODE MOVE MODE SET ROOT MODE
# NTREE MODES (general info) OCCURRENCE DESCRIPTION NOTES EXAMPLES WARNINGS BUGS ## OCCURRENCE
### ARB_NT <buttons in the first column>
## DESCRIPTION
### Pressing one of the buttons in the left column of the 'ARB_NT' window activates tree display and modification functions. ### You may also use the function keys F1 to F12. F1 selects the topmost mode, F2 the next ... ### The middle mouse button (placed anywhere within the tree display area) can be used to move the whole tree (works in most modes).
## NOTES
### A short descriptions of each 'MODE' is shown directly above the tree display subwindow. It informs about the differences between the left and right mouse key and tells if there are mode-specific keyboard shortcuts available. ### To execute the respective functions, the cursor has to be located within the tree display area while pressing the mouse buttons. ### The scale bar and its label can be moved by positioning the cursor anywhere on the bar, keeping the left mouse button pressed, moving the cursor to the desired position and subsequently releasing the mouse button. The label of the bar can be moved independently.
## EXAMPLES
### None
## WARNINGS
### no warnings
## BUGS
### no bugs