This section discusses various aspects of the use of preprocessors, including rules that apply to the command-line syntax for calling preprocessors. These aspects of use are presented in the context of two sample preprocessors, one written in ACUCOBOL-GT, the other written in C/C++. They include information on calling more than one preprocessor with the same command-line statement, command-line options forwarded to preprocessors by the compiler, and calling a preprocessor without the compiler.