The SDK will not report a RF signal sent from the PC.
Something that was maybe over looked initially and never fixed as it wasn't designed to work with the CM19 originally.
The SDK will report a sent PLC BVC and PCC will see this and act on it.
If you can find a CM15a I would recommend it over the CM19 mainly because of extra features and on
board memory.
However if your wishing to keep using the cm19 you'll need to use workarounds if you wish to have PCC or BVC react to a RF sent command.
As for windows commands with AHP.
I think this maybe a Smartmacro option and x10 has fixed issues with running batch files.
PCC actually runs faster executing a windows command than a batch file and faster if left open.
The syntax for a windows command is:
PCC path as the command and [Commandline name] as the argument.
Note: Commands are case sensitive
Hope that helps!
There is a thread I started on my forum which goes into detail on windows commands for PCC
PCC Commandline options