You will need to use Javascript pre-processing to generate the HTML. The example here should give you everything you need: http://forums.visokio.com/discussion/1072/scripting-in-content-view-2.7

Tried the following

<#<br />var array = subset("App_Name","NULL");
for (var i in array) {
#>
Hostname <#=array[i]#> App_Name
<#<br />}
#>

but get the following giberish

Hostnameboolean eb() App_Name Hostnameboolean hb() App_Name Hostnamecom.visokio.tzd Z() App_Name Hostnameint[] kb() App_Name Hostnameboolean Y() App_Name Hostnamecom.visokio.qc X() App_Name \

thoughts on what I did wrong?

You are using subset("App_Name", "NULL") which returns a dataset intended for further processing in other functions which accept a subset as an argument. The syntax you are using is effectively inspecting the internal properties of that subset object.

I'm not sure exactly what you want to do.
Note that subset("App_Name", "NULL") identifies the set of records where the field "App_Name" equals the text literal "NULL". If you want to match actual null cells (i.e. no value), use null lowercase and unquoted.

Some ideas:

recordCount(subset(...)) => the number of records in the subset

subset_uniquesList("SomeField", subset(...)) => an array of unique values in the field "Somefield"

Correct Steve....I made a mistake...the actual forumla is

SUBSET_UNIQUESLIST([App_Name], SUBSET([Early Exit],"Early Exit"))

Anyway to turn this into a list / bulleted list in the content viewer easily?

Ignore that. I'll go back to your previous comment re: Javascript