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Comprehension
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 Stepping into a
subroutine
How many times have you come across an EXSR and wondered where in the
10,000 statements it might be.
Wouldn't it be easier to just enter a G in the sequence number. Then,
when you have finished viewing or editing that subroutine, press F12 to
return to your starting point.
And if you have subroutines calling subroutines calling subroutines calling
subroutines: no problems - just keep drilling down with G and returning
with F12. (If you want to keep track of a particular location, see Bookmarks
below)
Once in a subroutine, functions such as Top, Bottom, Find work within
the subroutine boundaries.
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 Reference
You are looking at a DO loop with a limit of MAXDO, but don't know where
it is set. If you just had scan, you loose where you are, and you would
have to scan several times to see all the occurrences. Instead, enter
"R MAXDO" on the command line, and you get a list of all the
references to the field on a single display. If need be, you can look
at the context of each statement then return to the list.
The reference command also increments the drill-down level, so an F12
from the list returns to your starting point.
Reference keeps track of every statement where a field, file, indicator,
or literal is used. It also tracks some generic object types, so you can
see a list of all data structures or subroutines in a program, or record
formats in a display file.
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Bookmarks
If you are examining a program listing, there are invariably pieces of
paper, pens, rulers, and/or fingers keeping place marks of important sections
of code.
Poking your finger at the screen leaves dirty marks, so the Editor provides
a set of bookmarks that allow you to quickly return to different points
of interest.
Bookmarks also increment the drill-down level, so an F12 returns to your
starting point.
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Overview