I am not sure if your question was answered or not... The hserin/hserout works much the same way as serin/serout, except at the lower level of how the data is actually sent or received...
As for your code that you mentioned... It should probably look something like:
Code:
base_url bytetable "open http://www.website.org 80",0 ; wifi module spec syntax
user_id var word ; Not sure of the size you need...
user_id = 18 ; this would be unique for each unit/user
sethserial1 h9600 ; this is all you need for a Nano chip
hserout [str base_url\50\0," GET /respond/main.php?action=3&userid=", dec user_id, 13, 13]
Note: I am not sure if you will need CRs or LFs... I am assuming 13 should do but could be wrong... Also not sure if in your example if the ...org 80 should be ...org:80 or not, but that is an easy change. If this is not a content value but instead something you received somehow, than you would convert the bytetable into simple an array of bytes to receive this string...
Good Luck
Kurt