Code signing keys can be used to control access to the runtime store. This is a way to restrict or share access with other apps on a smartphone.

1. Import the required classes and interfaces.

   import java.util.Hashtable;
   import net.rim.device.api.system.RuntimeStore;

2. Create a hash ID for the object you want to store in the runtime store.

   long MY_DATA_ID = 0x33abf322367f9018L;
   Hashtable myHashtable = new Hashtable();

3. Store the object in the runtime store and protect the object with the CodeSigningKey object. Only applications signed with the key can read or change the object.

   RuntimeStore.put( MY_DATA_ID, new ControlledAccess( myHashtable, key ) );

4. Make sure that the object is protected with a particular code signing key, and invoke RuntimeStore.get, providing as parameters the hash ID for the object and the CodeSigningKey object.