[plt-scheme] MysterX & reference type

Hi list,

I'm trying to call a COM method which accepts a variant reference
which gets assigned by the foreign COM object.

(com-invoke myLoginControl "Login" session-id)

The session-id is supposed to be assigned a valid session id upon
successful login, -1 otherwise.

Which scheme type am I supposed to use for this session-id object?

Thank you,
Filip
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