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$K: Smart Callbacks Switch
Controls the generation of smart callbacks for procedures and functions that are exported by an application.
Syntax: {$K+} or {$K-}
Default: {$K+}
Type: Global
Menu Command: Options|Compiler|Smart callbacks
Target
Windows target
Remarks
When an application is compiled in the $K- state, it is required to use MakeProcInstance and FreeProcInstance Windows API routines when creating callback routines.
In the $K+ state, there is no need to use MakeProcInstance and FreeProcInstance.