Reference a common BookVars file

If you want to use a common BookVars file for multiple FrameMaker books, set the AltBookVarsFile parameter to point to the common BookVars file. The common file can be referenced by a drive letter or a UNC path descriptor.
Note: You must use the front slash as a directory separator with the AltBookVarsFile parameter. For more information, see Known Limitations.

; the rest of the file can be empty and is ignored