for moving between 802.11 nets without rebooting (where the plan9.ini config is useful), also note this line from plan9.ini(8):
// These options may be set after boot by writing to the //device's ctl file using a space as the separator between //option and value, e.g. // echo 'key2 1d8f65c9a52d83c8e4b43f94af' >/net/ether0/0/ctl you might wish to batch the echos up into commands "atschool" and "athome" for reduced typing.
