Question : Meaning of terminology for Dynamic DNS

I wonder if anyone can explain a little what the following terms mean?:

1. Update DDNS using the alternate port 21333 (bypass local web proxy).
WHAT DOES "ALTERNATE PORT" MEAN?

2. Disable WAN IP check (use local IP).
WHAT DOES "CHECK" MEAN?

3. Automatic Configuration Download From TFTP Server.
SHOULD I DOWNLOAD "AUTOMATIC CONFIGURATION" FROM TFTP SERVER?
OR IS IT AN "AUTOMATIC CONFIGURATION DOWNLOAD FROM TFTP SERVER?

4. Enable Automatic Configuration Download From TFTP Server (Option 66/150 & 67).
SHOULD I "ENABLE AUTOMATIC CONFIGURATIN DOWNLOAD FROM ´TFTP SERVER"?

5. Enable Router Advertisement Daemon (radvd).
WHAT DOES RADVD MEAN?

6. Please enter Bucket.
WHAT DOES "BUCKET" MEAN?

7. Usage type.
WHAT IS "USAGE TYPE" IN THIS CONTEXT?

8. You have been logged out as a result of being inactive for 30 minutes. Use the fields to login.
WHAT IS MEANT WITH THAT I SHOULD "USE THE FIELDS" TO LOGIN? WHAT FIELDS?

Answer : Meaning of terminology for Dynamic DNS

1. DDNS updates by default use port 53, alternate port means just use a different one (21333)
2. You took it out of context, so it doesn't mean anything to me.
3. You download the automatic configuration from a TFTP server
4. yes
5. RADVD stands for Router ADVertisment Daemon
6. Taken out of context....
7. You didn't give a context, so we don't know
8. ??