Another computer in the house

My younger sister who got herself a brand new portable laptop computer was asking me earlier if she can also access the internet using my DSL connection. Being a self- proclaimed internet technician, I tried connecting her laptop with another Cat5Ecable wire, just like my PC connection. And it worked! Now, we are two in the house who will be staying up until the wee hours in the m0rning. Also, we expect a higher electricity bill starting this month! Ha-ha!