Valid commands are:

  SELECT

  This command will select a service for inclusion in the QWK packet
  generation.  A single service number or range of service numbers may
  be entered.

  DESELECT

  This command will deselect a service or services.  A single service
  number may be entered or a range of service numbers may be entered.

  A service number entered alone will toggle the selected status.

Examples of valid commands:

  2            Toggles the selected status of service 2.

  SELECT 1     Selects service number 1
  SELECT 2-5   Selects service number 2 through 5
  SELECT ALL   Selects ALL services available
