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 FaxDriver
 Give fax driver a time slice
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 Syntax

    FaxDriver() -> lWorking

 Returns

    FaxDriver() returns .T. if any fax device has work to do.  It returns
    .F. if all fax devices are idle or done with their jobs.

 Description

    FaxDriver() is the main entry point for the Faxual II scheduler.  This
    is the code that allows sending faxes in the background. For proper
    functioning, while any fax device operation is in progress, you should
    call FaxDriver() at least once per second--preferably more often.

    Faxual II hooks the Clipper event system, so FaxDriver() will be called
    automatically whenever your program is in an input wait state.  Note
    that INKEY with no parameter (the non-waiting version) does not count as
    a wait state for these purposes, though INKEY with a numeric parameter
    does.