The only way I know to get information about the functions is the html files in the PSPSDK.
But the information is so limitted then I even don't know what the functions can do. For example, "sceNetApctlGetInfo"
Shall I guess what it will form the name of the function?
How can I get more information about the functions in the PSPSDK?
How can I get information about the functions in the PSPSDK?
It's not well documented because we don't know exactly what it does. It's a function provided by the PSP firmware. You can disassemble other firmware functions to see how it's called, or look at other examples to see what other people have already figured out. For example, the net/simple sample uses it.