Geoff Chappell - Software Analyst
The optional argument consists of whatever follows immediately within the same command-line token, provided that it does not begin with a hyphen or forward slash.
The argument is formally numeric. Values other than 1, 2, 4, 8 and 16 are coerced to 8, with a warning (D4014).
The /Zp option overrides earlier instances of itself (and is overridden by later instances). A first instance, /Zp8, is provided by CL as an initial option.