REDUCE

1.4 Switches and Globals

Generally, the name of an identifier which represents a switch will start with a ”*”. For example, *redefmsg and *usermode are switches. The value of a switch is modified with the functions on and off. Note that in the example below, the prefix ”*” is omitted when using on and off.

1 lisp> (on redefmsg)  
nil  
2 lisp> ⋆redefmsg  
t

The name of an identifier which represents a global ends with ”*”. options* is an example of a global.