Not sure if this helps. The example below checks return codes values, and and depending on what the value is, sends messages to the appropriate people.

*--Check to see if directories and log file exist and return appropriate;
return code.

DO CASE
CASE THISFORM.ErrorCode = "1"
RUN send "Error Message" John Jim Sarah

CASE THISFORM.ErrorCode = "2"
RUN send "some other error message." Jack Mary Tom

CASE THISFORM.ErrorCode = "3"
RUN send "another error message" Tom Joe Bill
ENDCASE