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