how does one insert a block from the command line

i would like to know what the format is for inserting a block/drawing drom the command line so i can use this later in a pull down menu.

my libary file path is set to.. c:\\users\\myname\\documents\\acad\\symbolsso i would suggest that from here you only have to give the path from the commandline what ever follows after that.

doing the following at the command line

-insert (enter)\\31-flange\\pn10-03.dwg.
(as the full path is: c:\\users\\myname\\documents\\acad\\symbols\\31-flanges\\pn10-03.dwg)

but this does not work. what should i put in the command line? what is the format?