What Happens At Logon

Recently when setting up a new user for an Account, a user nominated a subroutine as the RESTART Code and Command. The system hung (or to be more precise, recursively called the RESTART Code and Command ad infinitum). This prompted an investigation into the exact sequence of events at logon as an account and as a user. The Logic Flow could be represented by the following Pseudo Code

If Logging in as Account
   If LOGON verb is specified in Account Record in System File then
     Run LOGON Verb
   else
     If a Voc entry exists with same name as @ACCOUNT then
        Run @ACCOUNT Voc Entry
     else
        If a Voc entry exists called LOGON then
          Run LOGON Voc Entry
     end
   end
else
   If Logging in as User
     If LOGON verb is specified in User Record in System File then
        Run LOGON Verb
     else
        If a Voc entry exists with same name as @USERNAME then
          Run @USERNAME Voc Entry
     else
        If a Voc entry exists with same name as @ACCOUNT then
          Run @ACCOUNT Voc Entry
        else
          If a Voc entry exists called LOGON then
             Run LOGON Voc Entry
        end
     end
   end
end
If a Restart Code and Command is specified in User/Account record then
   Loop
     Run Restart Code and Command
   Repeat
else
   Loop
     Begin Case
        Case Default System Mode = "M"
          If Default System Menu (DSM) then Call DSM else Call Main
        Case Default System Mode = "S"
          Call Interactive SQL Window
        Case 1
          Call TCL
     End Case
   Repeat
end

(Volume 2, Issue 10, Page 5)