system("... ...")
system("...", "...", "...")
system("...&")
system("start ...")
system("start /min ...")
system("start /wait ...")
system 1,
exec
fork+exec
`` and qx()
open("...|")
open("|...")
Win32::Process
IPC::Open2
IPC::Open3
IPC::Run
IPC::Run3