Of course not. For this he would have to log into the other's account, but this is not allowed.
Anyway each player may only operate one account.
Browser games are an ingenious business idea to lure out money -
- more or less cleverly camouflaged as a real game sometimes.
So beware of caltrops, spring-guns and booby traps.
Warning! Texts above this signature may contain traces of irony!