Is it possible to write a Token contract which will trigger a certain function when the tokens are sent to a specific Address? Like let's say, if you send 5 tokens to 0x12345... a specific function will be called that sends another 5 tokens to 0x98765... This is just an example.
The token contract has a
transfer function that does the token sending. You can modify the token contract to check
if(recipient == 0x12345...) and then add your code to send.