Dataguard Log Query

This is my dataguard check script:

/home/oracle/bin/check
if [ $# -lt 1 ]; then
echo "usage: check <oracle_sid>"
echo
exit
fi

[Code]...

This is the output it gives on the primary:

INSTANCE_NUMBER INSTANCE_NAME
--------------- ----------------
HOST_NAME
----------------------------------------------------------------
VERSION STARTUP_T STATUS PARTHREAD# ARCHIVE LOG_SWITCH_WAIT
----------------- --------- ------------ --- ---------- ------- ---------------
LOGINS SHU DATABASE_STATUS INSTANCE_ROLE ACTIVE_ST BLO
---------- --- ----------------- ------------------ --------- ---
1 prod
xxxx
11.2.0.3.0 29-NOV-12 OPEN NO 1 STARTED
ALLOWED NO ACTIVE PRIMARY_INSTANCE NORMAL NO

[Code]....

SQL> Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

This is the output it gives on the standby:

INSTANCE_NUMBER INSTANCE_NAME
--------------- ----------------
HOST_NAME
----------------------------------------------------------------
VERSION STARTUP_T STATUS PARTHREAD# ARCHIVE LOG_SWITCH_WAIT
----------------- --------- ------------ --- ---------- ------- ---------------
LOGINS SHU DATABASE_STATUS INSTANCE_ROLE ACTIVE_ST BLO
---------- --- ----------------- ------------------ --------- ---
1 prod_stby
xxxx
11.2.0.3.0 29-NOV-12 MOUNTED NO 1 STARTED
ALLOWED NO ACTIVE PRIMARY_INSTANCE NORMAL NO

[Code]....

SQL> Disconnected from Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production With the Partitioning, OLAP, Data Mining and Real Application Testing options

When I run the following:

SQL> select archivelog_change#-1 from v$database;

On the primary I get:

ARCHIVELOG_CHANGE#-1
--------------------
4902447998

On the standby:

ARCHIVELOG_CHANGE#-1
--------------------
4902447999

Which makes sense to me as my understanding of this is that the log is written, send to the standby, applied, then applied on the primary, yes?

So my questions are:

Why is there a lower entry on the primary (234) marked as opening, when it's closing 235, and writing 236, what does LNS mean?

Why is the second archive on the standby saying "CONNECTED 0" and do RFS, & MPR0 mean?

My init files say this:

Primary:
log_archive_dest_1='LOCATION=/u01/archive/prod/arch'
log_archive_dest_2='SERVICE=prod_stby LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=prod_stby'

Standby:
log_archive_dest_1='LOCATION=/u01/archive/prod_stby/arch'
log_archive_dest_2='SERVICE=prod LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=prod'

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