Yeah you can only get 500 channels at one time. You can have more stored throught the V-Folders though. Just takes a little time, compared to just flipping backs on the pro-94, but in the end you have the ability to store many more channels; systems.
...anyway to answer your question. Like the others said, there are 500 channels. 10 banks of 50 channels each. Just push the number of the bank that you want to turn on and push it again to turn it off. The numbers that you see across the top of the display are the banks that are active.
With your scanner connected to Win96 program on the toolbar click on scanner then on Virtual Scanner, then on Refresh
The folder will load up with all that is programmed into the various V Folders.
If you wanted to change one of the folders with a different P96 file what you would do is
Click on write for the folder you wish to change
Find the P96 file that you wish to write to the highlighted folder
click on the file then open
then click on commit and it will write it self to the V folder.