The IPF compiler can produce a single output document by processing one master source file that imbeds other source files. The imbed control word (.im) sends a signal to the compiler to process each file in the sequence listed in the master file.

This process is most often associated with online documents. A portion of the master file for the online IPF Reference looks like this: 

:userdoc.
.
.
.
.im ipfcch01.ipf
.im ipfcch02.ipf
.im ipfcch03.ipf
.
.
.

If you are imbedding files, the source file that begins with the :userdoc. tag is considered the master file. The imbedded files cannot have :userdoc. and :euserdoc..

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