The following are the calls related to signals and messages.

The following calls work with signal bits.

• AllocSignal() Allocates one or more signals for intertask communication.
• ClearCurrentSignals() Clears specified signals bits of the current task.
• FreeSignal() Frees signal bits.
• GetCurrentSignals() Returns the state of the current task's signal bits.
• SendSignal() Sends one or more signals to another task or thread.
• WaitSignal() Waits for one or more signals to arrive.

The following calls create messages and ports.

• CreateBufferedMsg() Creates a buffered message.
• CreateMsg() Creates a standard message.
• CreateMsgPort()Creates a message port.
• CreateSmallMsg()Creates a small message.
• CreateUniqueMsgPort()Creates a message port with a guaranteed unique name.

The following calls delete messages and ports.

• DeleteMsg() Deletes a message of any type.
• DeleteMsgPort()Deletes a message port.

The following call finds a message port by name.

• FindMsgPort() Returns the item number of the message port having the specified name.

The following calls send different types of messages:

• SendMsg() Sends a message.
• SendSmallMsg()Sends a small message.

The following calls retrieve messages:

• GetMsg() Gets a message from a message port.
• GetThisMsg() Gets a specific message.
• WaitPort()Waits for a message to arrive.

The following calls reply to messages:

• ReplyMsg() Sends a reply to a message.
• ReplySmallMsg() Sends a reply to a small message.