Replacement for getglobal?

["J. Perkins" <jason@...>]

Maybe a stupid question - how do you implement the functionality of 
the old "getglobal" tag in the work 3 version? That is, I want to 
fire my method when a script tries to access a global variable that 
doesn't exist, but *not* fire when a script accesses a global that 
does exist. I tried catching the "gettable" method on the globals 
table, but now I get *everything*: access to all globals and 
functions, including built-ins like print().

FYI, this is for a component system. When the user does something 
like 'local x = MyPackage.MyService()', I want to see if a "package" 
named "MyPackage" (a DLL or .zip of scripts) exists. If it does I 
load, create a Lua table to represent it, and then stick it into the 
globals table.

Jason
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