In addition to tags, you can include control words in your source files to request special processing from the IPF compiler. A control word is placed at the beginning of a line, and starts with a period (.). Control words must begin in column one.

The IPF compiler recognizes the following control words:

• im filename
  Imbed this file in the current file.
  .*
  Treat this line of text as a comment and do not interpret.
  .br
  Start a new line of text.
  .nameit
  Perform compile time symbol substitution.
  .ce
  Centers Text

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