From Adobe Developer FAQ:
AcroRd32.exe /t path "printername" "drivername" "portname" —
Initiates Adobe Reader and prints a file, whose path must be fully specified, while
suppressing the Print dialog box.
The four parameters of the /t option evaluate to path, printername, drivername,
and portname (all strings).
● printername — The name of your printer.
● drivername — Your printer driver’s name, as it appears in your printer’s properties.
● portname — The printer’s port. portname cannot contain any "/" characters; if it
  does, output is routed to the default port for that printer.
WaitRun(), could print a PDF file, but how can I get the complete string???
We need to find:
Default printer.... ?? GetDefaultPrinter()
Port Name.... ?? PrnGetPort()
Driver... ?? ???????
Path .... ?? Full path and name of file...
This should help us all to print without the need of any external software.... Unless there is a native way?????
Any ideas Mr. Rao?????
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Bayron Landaverry
xBasePHP.com
(215)2226600 Philadelphia,PA, USA
MayaBuilders@gMail.com
Guatemala
FWH25.06--Harbour 3.0.0--BCC7.7--UEstudio 10.10
Windows 10
FiveWin, One line of code and it's done...