MTSNDFAX
Initiates the communication for faxing and does the actual faxing of the document. This can be located on either the host system or a remote site. Each MTSNDFAX must have a unique ID (ServerID). MTSNDFAX will ask MTFAX for faxes to send and will update MTFAX with the results of the fax sent.
MTFAX
Looks for fax requests and completion/statuses of faxes from MTSNDFAX. MTFAX will not do anything until it has a request from MTSNDFAX. MTFAX prepares the fax document by converting it to a TIFF and will update the database accordingly with the status received from MTSNDFAX. MTFAX monitors two folders, System\Fax\Request and System\Fax\Complete. It will look in the Request folder first, then Complete folder. It will continue to repeat this process whole time it is running.
MTREQSVR
Is the communication layer between MTSNDFAX and MTFAX via MTWEBSVR (HTTPClient)