Geraniums Indoors?

I was at a friends home last week and she had these beautiful geraniums in her window and they were actually blooming. I asked her, "Whatever gave you the idea to bring these geraniums indoors?" Apparently, her mom and grandmom always brought the geraniums in for the winter and she just kept the tradition. She told me she digs them up in the Fall and repots them for indoors in the Winter. Now, I have heard of people bringing in their geraniums, but placing them in the basement not in a living room window! How wonderful to see summer blooms in the Winter! So kudos to this friend for so cleverly bringing summer inside. The window faced North so they are not getting direct sunlight, but how green and lush they look. So, I'm thinking I might try this next year as I have a nice size window ledge facing North. Just to see something blooming would be heaven! I'll let you know how it works out -- provided I remember to do it!