ORA_FFI Package

I'm not familait with 'ORA_FFI' can someone give hi-level highlights of the 3 main functions and what do they do (ORA_FFI.LOAD_LIBRARY,ORA_FFI.REGISTER_FUNCTION,ORA_FFI.REGISTER_PARAMETER)
Also a link for more details will be appreciated
“ libhandle := ORA_FFI.LOAD_LIBRARY(dirname, libname);
funchandle := ORA_FFI.REGISTER_FUNCTION(libhandle,'purchase',ORA_FFI.C_STD);
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --id
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --plan
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --v3careercreatedate
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --jurisdiction
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --membertype
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --transdate
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_INT_PTR); --warning
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --warningmsg
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_INT_PTR); --error
ORA_FFI.REGISTER_PARAMETER(funchandle,ORA_FFI.C_CHAR_PTR); --msg
“

I found a link
http://www.oracle.com/webapps/online-help/reports/10.1.2/state/content/navId.3/navSetId._/vtTopicFile.htmlhelp_rwbuild_hs%7Crwrefex%7Cplsql%7Cbuiltins%7Coraffi%7Cpkg_ffi%7Ehtm/

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I've created a test.dll which contains caps func as follows:
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else
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dll_handle ORA_FFI.LIBHANDLETYPE;
winexec_handle ORA_FFI.FUNCHANDLETYPE;
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break;
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