Transfer of handle to database connection between the running ESL scripts

A transfer of handle to database connection between ESL scripts may be done by RPC procedures. In the declaration of the RPC procedure, you have to tag the parameter that represents the handle to database connection by enumerated type DB_HANDLE. An algorithm is contingent on the existence of a database connection. If the handle to database connection is an invalid value or it points to a missing database connection, the algorithm ends with an error. 

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