URL to create new record with link to a parent record

Hi,

the parameters described on https://msdn.microsoft.com/en-us/library/gg328483.aspx?f=255&MSPPError=-2147217396 dont tell us how to open a window to create a record where a parent link is given.

For example, I want to open a new window where a contact to a certain account should be created.

What is the parameter to pass the parent record id ?

Thanks.