Devnotes: [f_n] calls "SEEK Process Limit" function; "Funct…

Devnotes: [f_n] calls "SEEK Process Limit" function; "Function[n]".
This method allows for [n] to carry [NAN] without violating "Two's in Common". This can be useful for stepping between "Unsigned Ones'" and "Signed Two's" Complements.
#SIRISYS