リファレンス、WshEnvironment オブジェクト

まんま

Set WshShell = WScript.CreateObject("WScript.Shell")
Set WshSysEnv = WshShell.Environment("SYSTEM")
WScript.Echo WshSysEnv("NUMBER_OF_PROCESSORS")
Set WshShell = WScript.CreateObject("WScript.Shell")
Set WshSysEnv = WshShell.Environment("SYSTEM")
WScript.Echo WshSysEnv.Length
WScript.Echo WshSysEnv("OS")

Set WshSysEnv = WshShell.Environment("USER")
WScript.Echo WshSysEnv.Length
WScript.Echo WshSysEnv("HOME")