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The Coord mode allows one to import or export coordinates of atoms in text format (in angstroms or Bohrs). When switching to this mode, the text with coordinates is refreshed according to current molecule; while switching from this mode to another, the molecule is refreshed by the text (if there have been changes made in the text). The format of entered text is very free (e.g., sections with atomic coordinates from Gaussian or GAMESS-US output files can be entered). The buttons Copy and Paste can be used to quickly copy the text into clipboard or from the clipboard into the textbox. Pressing Paste twice automatically switches to the Image mode. The text is automatically refreshed for current molecule by pressing "Show sequence" or "Angstroms/Bohrs", so pressing these control keys can restore accidentally corrupted or replaced text.
Chemcraft can calculate root-mean-square distances between the Cartesian coordinates of two molecular structures ("Tools/RMS compare structures" menu item, see here). Besides that, the program can merge multiple structures to allow the user to visually see the difference between them.
Menu items "Edit/Add atom" and "Edit/Add fragment" allow new molecules to be built from individual atoms or molecular fragments (radicals, etc). The possibility to edit the set of standard fragments and supplement it with custom fragments is provided ("Edit/Add selected fragment to database"). Keys Ctrl+C, Ctrl+V provide the transfer of fragments via clipboard (e.g., to copy a radical from one molecule to another).
For the output files with geometry optimization, scan jobs, often the molecular geometry is switched several times during the optimization. To avoid this problem, choose the Tools button at the left (the job node should be clicked firstly), then "Set common orientation for all geometries".
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