I work when I’m at home on my mac pro, but when I have to go places I want to use my mac book pro but make sure all my calendar information is up to date. After Google’ing around a bit, i found some applications but they were $50+ so here are few easy steps to sync from one computer to another for iCal:

Step 1: Get your other computer’s IP address, and make sure SSH login is enabled

Step 2: Sync your SSH keys so you dont’ have to type your password everytime:

Step 3: rsync your calendar data over

Step 4: crontab -e (to edit your crontab)

And done, this will sync your calendar every hour to your other mac from your main computer