A catheter for applying ablation energy to biological tissue having biological fluid flowing thereby includes a shaft having a distal-end region defining a tissue-contacting surface and a fluid-contacting surface. The compounds are flavanoids, including flavanones, flavanols, and chalcones. Positive feedback and, as necessary, instructive aid are provided to make the experience a positive one for both the novice and the expert player. The mobile device sends the user certificate to the computing device for installation on the computing device. The parameter server uses this connection to transmit to the device parameters which are used for configuration of the device.