remote management

i am out of the country at the moment and my mother is having trouble with her imac. I need to know how I can remotely control her computer from where i am so i can work on it. Thank you for any help in advance.

Join.me is a convenient way of getting access, your mom just visits the website, starts a new meeting and gives you the 9 digit number. You join that meeting and she can hand over the presenter to you and off you go..