Rehabilitation for entry to Canada

• What does it mean to be rehabilitated in respect to entering Canada?
• How long will it take to get a decision on my individual rehabilitation application?
• What is the processing fee for an individual rehabilitation application?
• If my individual rehabilitation application is refused, will I get my processing fee back?
• When can I apply for individual rehabilitation?
• What can I do if I want to come to Canada but do not qualify for rehabilitation?