No.
The only way to duel weapon is to become a blade after getting a mercenary to level 60. These are the only type fo players that can duel weild weapons
go to your pip-boy and go onto weapon then select the weapon of your choice
To equip a specialist weapon you will first need to buy a specialist character (Viper, Hawk, Raven or Scorpion) Next you need to equip your specialist in the Character tab. Then you are enabled to...
you cant there for when u play online