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При логине в контест сохраняем SID в специальную куку
SID_{role}_{contest_id}
.По адресу
/cgi-bin/link/{contest_id}/{run_id}
запускается скрипт link, который смотрит, какая кука есть у пользователя для запрошенного контеста, и редиректит на соответствующую программу, подставляя SID в get-параметры.