Phil, I have created a new thread as your question really has nothing to do with the address of NK Immigration...
In answer to your question... you need very little to get another 90 days worth of visa in Thailand on a multiple entry non O.
You need to exit Thailand (no charge, but they do need to stamp your passport & remove the 'departure card' from your passport), cross bridge - 15 baht from memory, but does go up to 20 baht on 'holidays' etc.).
Exit bus & enter Laos, go to window, get two forms from officers (you can get from right hand or left hand window, but left hand window usually has zero queue). Fill in two forms, add 1 passport photo, passport, 1,500 baht (or $31/$33 USD, if you have - it is a slightly different USD sum depending on where in the world you come from) and hand back to right hand window. Officer will check you have given correct documentation/money & then tell you to wait at window.... usually 3 now - 2 is the one to the left of him, 3 is just around the corner.
After a few minutes/hours (it depends how busy it is) the window will wave your passport at you. Note it is important that you are alert for this as there is no attempt at "name calling" also the immigration officer makes very little attempt to verify that he gives the correct passport to the correct person. I do know of one case when a person who was happier than he should have been to attempt border crossings ended up in Vientiane to discover he had the wrong passport !!! Amusing, maybe BUT the Thai side certainly will not let you back on a passport other than your own!!!
When you get back your passport CHECK IT IS YOURS !!! They will also give you a "swine fever" form, which you need to fill in - basic stuff, have you been feeling ill, where have you been (countries) in last x days..
You can now proceed into Laos. You will see 3/4 "Passport Control" queues in front of you. You do not need to queue for these, you have already been processed by the computers - walk past the queues & through the 'gates'.
Now (because of "swine fever") you will find a desk with masked officials sitting behind. Hand in your swine fever form & they will give you a business card with Laos numbers to phone if you go down with it...
Go to next booth & you will have to pay (I can never remember if it is 20 or 50 baht) customs duty..walk on & an officer will examine your passport & tear the 'customs slip'..
Now in Laos - ignore everyone offering you a taxi & proceed to road.
Turn left at road and you will be facing duty free, about 100 metres away. Walk to duty free - beware they drive on the wrong side of the road here!!!
After duty free finished head back towards the place that you entered Laos - there is "exit" line before the "entrance" that you walked past on the way to duty free, but probably missed in your rush to duty free bargains.
Queue and get passport stamped to exit Laos. Next is a booth for Laos nationals only (I think they have to pay to leave the country) - you do not need to stop/queue there. Pass an officer sat at a desk who will examine your passport. You will now have to run the gauntlet of some more taxi drivers who will want to take you to all corners of Thailand. (If you have so much duty free you can hardly walk then you may actually want to avail yourself of one of these to take you to NK - BUT look at "duty free threads" on here as well).
Pay 15 baht for bus across bridge.
Enter Thailand & obtain "entrance/departure" card from an officer who will be wandering about with them. Fill in both parts of the card - taking care to ensure that you put your visa number in the place provided.
Queue (usually for the longest time of the entire journey!!!!). Hand passport & filled in card to immigration Officer (NOTHING ELSE) wait while he stamps & returns passport - carefully ensure that the date he has stamped in your passport is 90 days (& not 15, or 60) from today's date. If it is not 90 days then point out the visa in your passport to the officer (politely) & he will alter to 90 days. I say this not because of NK (who I have never had a problem with) but from my experiences in the past with BKK.
You will now have to sit at a "swine fever" desk (complete with masked officers) who will politely & efficiently take your passport & ask questions & fill out the from (same as Laos questions) & hand you a business card with numbers in Thailand to call when you go down with it.
Next you go through the 'walkway' of customs, where you may, or may not, have your person & baggage examined for illegal (or 'extra') contraband.
Now you are in Thailand, but, if you are driving, it is about 2 kms. before you see a "welcome to Thailand" sign...
