imps
bidding...
PASS - (1H) - 2D - (2H)
DBL* - (3H) - 4C - (PASS)
Double was "reverse rosenkrantz" showing diamond support without top honor (don't ask me why reverse, that is what this partnership plays, no known reason why). Three hearts was "game try" in hearts.
Without a specific agreement as to the meaning, how are you likely to understanding 4C?
pure game try
mild slam try
gerber
offering help in determining to defend 4H or take a 5D save
offer of alternative contract (non-forcing)
offer of alternative contract (4D or 5C/5D)
or in outer space - lead directing
or some combination of these.

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