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The names of global variables in VMD follow the same rules as for
variables which are members of a particular class. It is recommended
to use one of the following suggestions when naming a global variable:
- Choose a single-word name, and use all lower case.
- Choose a name similar to the class name of the variable, and
prepend ``vmd'' to the name.
- If it is assured there should be only one instance of a
particular class, and the instance should be global, choose a name
identical to the base class of the variable but with the first
letter in lower case.