You should be able to make multiple socket connections to IQFeed, as long as they are all on the same machine. IQFeed is designed to have multiple socket connections and applications connected to it.
In IQFeed, the minimal number of connections needed is made to the DTN servers. The communications to the server is compressed binary to minimize traffic over the internet. IQFeed maintains its own internal symbol, data, and client lists, and then sends out the data as needed by the clients to minimize duplication of data.
Adding a second client watching the same data just adds a little overhead of sending out an update to two or more socket connections instead of one, which shouldn't affect IQFeed an extra lot. The data is received once from the servers and then just sent out as much as needed by the client applications.
The more symbols you watch and the more clients you have running or additional socket connections you maintain to IQFeed, the more efficient your application code might need to be to run well.
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