[Zope] threading

[Nicholas Lo]

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Just a simple question.
According to Amos' How-To: Thread Safety in Zope 2, what is mutable
global or shared variables?? What is the scope of such global variables?
Zope wide? module wide?
If global variable is not permitted, how can I approach thread
programming in Zope? Without global variables, how can I control
threads?
Please kindly help

Regards,
Nicholas Lo
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