Hello.

Unfortunately, we don´t have build-in functionality for this, you would need to implement it via custom code. You can e.g. place a simple web part on your page, which will get current user´s name (from CMS.CMSHelper.CMSContext.CurrentUser.UserName) and current time (DateTime.Now) and save it e.g. to custom table when page is opened. Then you can see list of user who opened given page and when.

Best Regards,
Radek Macalik