[question]userRPL, functions or (sub)subprograms and directories

[pier4r]

If I use a DIR ... END structure (see previous posts) is there a way to pass variables that are not globals, that AFAIK are pretty slow in userRPL, between subprograms in a smart way or I have to pass every time the variables leaving a copy on the stack as usual?

Update1: so far instead of passing long lists of local variables I just decided to use globals. Maintenance value > speed value (because with 'easier' code one gets correct results, with premature optimizations one gets necklaces of fails)