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Head to the Google Calendar page.
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Either sign in to your current calendar or create a new one.
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Once you're done, click the Settings menu (little gear icon) at the top of your screen and select the Calendar tab.
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Click the link under the Sharing head to see your sharing options.
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You can make the calendar public to everybody, but you don't have to — just enter the e-mail addresses of the people you do want to view the calendar.
You can also give each person the ability to read or modify your calendar. Click Add Person when you're done. Add as many as you want.
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When you're done, click Save.
Each person will get a link to the calendar.
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Sign in to your Google Calendar and look to the left side of the page.
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Under the heading of Other Calendars, if you don’t see the calendars you've been invited to share, then click the Add link to enter the e-mail addresses associated with those calendars you'd like to see.
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For the sake of convenience, make these calendars different colors so you can tell all of the appointments apart.
Just click the down arrow next to the calendar to choose a color.