Waymarks can now contain two extra parameters: "script" and "output." For example:
[velia_storage]
X=84.66
Y=-78
Z=832
wait time=10000
script=myscript.ahk
output=536723
The script parameter will launch whatever script/program appears after the equals sign. The output parameter will output the number to log.txt such that if you want a single script to react based on what appears in log.txt, you can do that (e.g. if 536723 appears in the log, press keys q, r, and z).