{OBJ_CONT(Rel_Id, n1, c1, c2, c3)}

Displays information from a related object via a relationship to the current object.

'Rel_Id' is the id of the relationship to the other object from the current object.

The current object can be changed by preceding the obj_id with another ID followed by a colon (:) e.g. 1234:5678 refers to objects refernced from object 1234 via relationship 5678.

You can also navigate up or down to a different object via a relationship by preceding the obj_id with another Relationship ID, e.g. 5678;91011 refers to the first object from the current object via relationship 5678 and then on to the object via relationship 91011. If you want to navigate multiple children (or parents) then precede the relationship ID with an *, e.g. *5678;91011.

You can further qualify the relationships by using the '$' symbol at any level to access the object markers, followed again if required by '$$' to indicate a relationship quallification.

So

"1234$markers&1" would refere to all objects via link 1234 that have marker 1 set.
"1234$markers&1$$5678" would refer to all objects via link 1234 that have marker 1 set and a relationship 5678 to any object.
"1234$markers&1$$5678.9100" would refer to all objects via link 1234 that have marker 1 set and a relationship 5678 to object 9100.

'n1' is the object part to be displayed.

'0' displays the ID of the object.
'1' displays the title of the object.
'2' displays the actual text from the object if it exists. 
'3' displays the title and the text.
'4' displays the title as '1' but as a link to the object.
'5' displays the text as '2' but as a link to the object
'6' displays an image or a full URL.
'7' displays the title as '1' but as a link to the current object. 
'8' displays the sum of the value of the objects for types 20,22,23
'8' redirects to the URL for type 12
'9' displays the title as '1' but as a Tab link to the object.
'10' displays an image Small thumbnail or a simple unlinked date.
'11' displays an image Large thumbnail or a simple linked date. 

If (a '0' is specified for 'rel_id' and the object is a user object) or (a '-1' is specified indicicating the current user) then

'1' is the user's title,
'2' is their forename,
'3' is their surname,
'4' is their email. Note that you only see the email if you're a logged in user.
'5' is their Home Country
'6' is their Login Name

'c1' is an optional tag name for the object title e.g. h3

'c2' is an optional class name for the tag specified in 'c1', if no tag is specified then the class will be applied to the item itself.

'c3' is an optional XML element for XML objects or the Special Variable number to place the result into.