MyVRZone can automatically synchronize a HomeAwayConnect (rentors.org) calendar to itself and/or it can synchronize out to other advertisers. Here's a guide for choosing the right one for you.
The system needs to know the login info for your account at each advertiser as well as how to identify your particular property there in order to do this.
Once configured, automatic updates will happen nightly if HomeAwayConnect (rentors.org) is your Up-To-Date Calendar or whenever a change is made to a reservation's date or status otherwise.
Synchronization can also be run manually from the "Online/Web>Calendar - Synchronize Now" menu item when logged in.