Creating a symbolic link is done in the properties view of the page that will contain the link.  There is a form where a user supplies a name for the link and a path for the linked page.  When submitted the URL has the following form:

!-http://host/PathToPage?responder=symlink&linkName=<linkName>&linkPath=<linkPath>-!

First we need to create some pages to play with.
!|Page creator.|
|Page name.|valid?|
|LinkingPage|true|
|LinkedPage|true|

Now we create a symbolic link named !-SymLink-!.  This links !-LinkedPage-! as a child of !-LinkingPage-!.
!|Response Requester.|
|uri   |status?|
|LinkingPage?responder=symlink&linkName=SymLink&linkPath=LinkedPage|303|