makeskel --package=syshelpers --input=m:\Lazarus\testing\SysHelpers\syshelpers.pas --output=syshelpers.xml
This option tells FPDoc what input file should be used. The argument can be just a filename, but can also be a complete compiler command-line with options that concern the scanning of the Pascal source: defines, include files, syntax options, as they would be specified to the Free Pascal compiler when compiling the file. If a complete command is used, then it should be enclosed in single or double quotes, so the shell will not break them in parts.
makeskel --package=rtl --input=c:\Prg\Lazarus\TrunkAll\fpcsrc\packages\rtl-objpas\src\inc\syshelpers.pp --output=syshelpers.xml
See package as a CHM. If it goes into the same CHM, it has the same package. If not, it is a different package.