RS String
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RS String is a codename for a custom string data-type used in the RuneScape protocol.
The string data-type is used to hold a series of characters in order to form a message.
Old Engine Protocol
In the old engine client, the RS String datatype is delimited by a newline character (value "\n").
New Engine Protocol
In the new-engine client, the RS String datatype is delimited by a null byte (value 0).