title: Wordpress - User registration on a multisite
body: <p>I have a wordpress multisite with two sites.</p>
  
  <p>On the first site I have installed Gravity Forms and there I can use a hook after submission of the form to do some stuff.</p>
  
  <p>On the second site I use the Exchange Membership Plugin from iThemes. If a user fills out the form on site 1 i want to create a members object on site 2. </p>
  
  <p>Do you know any section within the wordpress codex how I can code this registration process? I have the hook of the gravity form, thats not a problem I assume but how can I add the user in the second site?</p>
  
  <p>Thanks!</p>