Question

It would be nice to know how to reference the macro variables in other tasks/code nodes.

Answer 1

You could take a snapshot of SASHELP.VMACRO (macro variable dictionary table):

data macs;
  set sashelp.vmacro;
run;

This can be handy if, for example, you want to compare the macro variables present at one point in a process versus those present at another point:

data macs_before;
  set sashelp.vmacro;
run;

...
... /* Other stuff here... */
...

data macs_after;
  set sashelp.vmacro;
run;