It depends on what you mean by "command". Generally an url encoded parameter list looks something like this: www.mywebsite.com/gnet.php?parameter1=value1¶meter2=value2¶meter3=value3 etc...
I haven't looked at the gnet PHP script so can't be of much help there, sorry.
I haven't looked at the gnet PHP script so can't be of much help there, sorry.