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 Method 1: Create Production and a Test installation of TWiki. 
 Duplicate the twiki/binandtwiki/libdirectories for the Test version, adjusting the paths in the newlib/TWiki.cfg, thetwiki/data; thetwiki/templatesandtwiki/pubdirectories are shared. Test Plugins and other new features in the Test installation until you're satisfied.
 Copy the modified files to the Production installation. You can update a live TWiki installation and users won't even notice.
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 Method 1: Safely test on-the-fly by creating separate Production and Test branches in your live TWiki installation. 
 Duplicate the twiki/binandtwiki/libdirectories for the Test version, adjusting the paths in the newlib/TWiki.cfg, thetwiki/data; thetwiki/templatesandtwiki/pubdirectories are shared. Test Plugins and other new features in the Test installation until you're satisfied.
  If you modify topics using the new features, live users will likely see unfamiliar new META tags showing up on their pages - to avoid this, create and edit test-only topics to try out new features. Copy the modified files to the Production installation. You can update a TWiki installation live and users won't even notice.
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 | DevALERT: If you use functions not in Func.pm, you run the risk of creating security holes. Also, your Plugin will likely break and require updating when you upgrade to a new version of TWiki. | 
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 |  If you use functions not in Func.pm, you run the risk of creating security holes. Also, your Plugin will likely break and require updating when you upgrade to a new version of TWiki. |