OK; I understood what it could be used for. What I didn't understand is how S11.EXE is used (its syntax).
S11 -? returns nothing
S11 /? returns nothing
S11 returns in a window
This program checks Touchstone files
for |S11| > 1. These improper values
may indicate invalid VNA calibration.
No files found with |S11| > 1
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F1AMM (Fran?ois)