Select a source program for display

ITST Menu Option 1.1, then
select program from list

Set monitoring for a program

MONITOR command
or PF5 from Source Listing

View a Monitoring Status display

STATUS command
or PF12 from Source Listing

Interpret the information the application provides when it detects an error

View the Automatic Breakpoint,
press PF1 for help

Display the value of a data item in a Keep window

Type k to left of variable, place cursor under variable, press Enter

Modify main storage

Overtype value in Keep Window
or
Type d to left of variable, place cursor under variable, press Enter for a CORE Main Storage display; on the CORE display, overtype the values and press Enter

Set an unconditional breakpoint

Type u to left of instruction,
press Enter

Remove a breakpoint from the Monitoring Status display

Use PF12 to view Monitoring Status;
type r next to UBP, press Enter

Remove a breakpoint from the Source Listing Display

On Source Listing, overtype U with x, press Enter

Remove a data item from a Keep window

Type x to left of Keep window entry, press Enter

Resume program execution

RESUME command or PF5