The molecule list contains information about all the loaded molecules, including those which are not properly called molecules, such as a Raster3D file or ``graphics'' molecule (see section §). Each molecule has a unique id, which is assigned to it when it is first loaded. These start at zero and increase by 1 for each new molecule. When a molecule is deleted, the number is not used again. There is one unique molecule, called the top molecule top molecule, which is used to determine some parameters, such as the center of view, the data in the animation form, etc.
The list of available molecule ids
is available with the command
molinfo list, and the number of loaded molecules is found with
molinfo num. The command molinfo top returns the id of
the top molecule. One other command, molinfo 
num
get index,
returns the num'th molecule index on the list,
starting from 0. (See section §). In all cases,
a molecule id of -1 is returned when no other valid id exists.
Examples: vmd > molinfo list Info) 0 1 2 vmd > molinfo top Info) 2 vmd > mol top 1 vmd > molinfo top Info) 1 vmd > molinfo num Info) 3 vmd > mol delete 1 Info) Deleted 1 molecules. vmd > molinfo list Info) 0 2 vmd > molinfo top Info) 2 vmd > molinfo index 1 Info) 2