You do not really require the 910 connected to a computer using the TomTom Home software, but it can help when transferring a location that you have found using say MultiMap.
To create POI's onto the 910 direct,
Main Menu - Change Preferences (go to next page) - Manage POI's - Add POI Category (you can name this to suit a specific group e.g. Disney Hotels, Petrol Stations,
Walmart, Shopping Centres etc what ever you want) You are then given the choice of Icon to represent this category. Select Done
Now you need to ADD POI's into the category that you have just created.
Main Menu - Change Preferences (go to next page) - Manage POI's - Add POI.
You now need to select your newly created POI CATEGORY from a scrolling list, when this is selected you will transfer to the ADD AS POI screen, where you can locate your POI (hotel, petrol station, or whatever, by entering its postal address or post/zip code or actually selecting the location on the map (This is when I sometimes use Multimap to find the location and then select the same location on the TomTom map. TomTom by default will name your chosen point as its building number & road name, but you can rename this to whater you want e.g Ponderosa North I-Drive.
Just repeat the ADD POI's sequence for any other Ponderosas in the area and save with a different name e.g Ponderosa South I-Drive. You also have the option to enter the phone number of the POI's that you create. This can be useful if using a bluetooth phone, as you can dial the location by selecting from the main menu - MOBILE PHONE - CALL - POINT OF INTEREST, then select the relevent POI. Remember also that you can choose a computer voice to announce your indivual POI's as you approch them
Hope this helps