Triggering animation actions and media object actions

A computer system comprising:

• a processor;
• a memory operatively coupled to the processor;
• and
• a program module (i) which executes in the processor from the memory and (ii) which, when executed by the processor, causes the computer system to detect and manage congestion on a shared network link by:
• determining a loss rate between the computer and a receiver operatively coupled through the shared network link, the loss being determined based on a Real-Time Control Protocol (RTCP) report;
• determining a round-trip time (RTT) between the computer and the receiver based on the RTCP report;
• determining whether the shared network link is congested based on the loss rate and the RTT;
• and
• upon determining that the shared network link is congested, performing a back-off operation on the computer, the back-off operation reducing an allocated bandwidth of the computer on the shared network link.

A computer-readable medium having computer-executable instructions stored thereon which, when executed by a computer, cause the computer to:

• determine a loss rate for a plurality of data packets sent from the computer to a receiver operatively coupled through a shared network link, the loss rate being determined based on a Real-Time Control Protocol (RTCP) report sent from the receiver to the computer regarding lost packets from the plurality of data packets;
• determine a round-trip time (RTT) between the computer and the receiver based on the RTCP report;
• determine whether the shared network link is congested based on the loss rate and the RTT;
• upon determining that the shared network link is congested, perform a back-off operation on the computer, the back-off operation reducing an allocated bandwidth of the computer on the shared network link;
• and
• upon determining that the shared network link is not congested, perform a recovery operation on the computer, the recovery operation increasing an allocated bandwidth of the computer on the shared network link.