SMSX ActiveX Control lets you send SMS messages to a GSM mobile telephone. To do this the control uses your modem or ISDN line to connect to the so called SMS Centre (SMSC) of a telecom company and deliver your message there.
The SMSC takes care of forwarding your message to the recipients. This may include communication with other telecom companies. SMSX fires an event with a result message after sending the message to the SMSC for each of the recipients.