IDF debugger invocation

If you want to use an interactive utility to debug your program, invoke the IDF debugger by performing the following steps:

Specify the problem load module and the extract file that contains the debugging information by entering the following commands.
```
ALLOC FI (ASMLANGX) DS('hlq.ASMLANGX') SHR
TSOLIB ACT DS('hlq.LOAD')
```
Invoke IDF by entering the following command:
```
ASMIDF MYCODE
```
Press F9 to get the Program Source and Disassembly view.