>> fork() is far less efficient than Windows type threading.

Yeah, but a credible "multi-tasking" operating system ought to be able
to do both without excessive messiness.  Anything otherwise is denying
the programmer access to the capabilities used by the operating system
itself (ie to create new application instances.)  (This is assuming you
define "fork" approximately as "create a new process that doesn't share
the address space of the current process" and "thread" as "create a
process that does share at least part of the current address space.)

BillW

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