VMware module for ansible

Hi team,

I saw some vmware module on ansible website. Each module requires username, password and hostname. why it is so ?

Why each module need these details ? below are some module.

-name:Rename a virtual machine (requires the virtual machine's uuid)

  vmware_guest:

   hostname:"{{vcenter_hostname}}"

   username:"{{vcenter_username}}"

   password:"{{vcenter_password}}"

   validate_certs:no

   uuid:"{{vm_uuid}}"

   name:new_name

   state:present

  delegate_to:localhost

-name:Remove a virtual machine by uuid

  vmware_guest:

   hostname:"{{vcenter_hostname}}"

   username:"{{vcenter_username}}"

   password:"{{vcenter_password}}"

   validate_certs:no

   uuid:"{{vm_uuid}}"

   state:absent

  delegate_to:localhost

-name:Manipulate vApp properties

  vmware_guest:

   hostname:"{{vcenter_hostname}}"

   username:"{{vcenter_username}}"

   password:"{{vcenter_password}}"

   validate_certs:no

Regards

Abhinav