yes, however certain new instruction that USB3.0 supports will not be backwards compatible. However, most USB 3.0 devices should work in a 2.0 system. To be certified a device does not have to be backwards compatible, so in the end it will be up to the manufacturer of the component as to whether or not they will provide backwards compatibility.
PCI, PCIe.
It depends entirely on when they were made. If it was within the year it came out then you probably have a 50/50 chance. Most of the older b ONLY devices probably not. The dual b/g may have a better chance of it being compatible as it was around that time so much better chance. The b/g/n capable should have it already built in.
wireless modem is a modem built in with wireless router, people use router seperately to connect to internet because their modem doesn't have a built in router. you can replace a wireless modem to a wirelss n modem.
There are two main ways to do this: 1. If your wireless router supports WDS, get another WDS-compatible router, and configure it to connect to your main router. 2. If your router is not WDS-compatible, you can pick up a wireless range extender for about $20-$30.
Yes, a wireless n adapter is backwards compatible with wireless g. Check the box you are buying and it will tell you if it is compatible with which wireless ranges.
Yes it is backwards compatible
There is nothing to be compatible with. Wireless A (IEEE 802.11a) was the first standard of the IEEE 802.11 standard.
Sort of. Almost all Wireless N routers support the G protocol aswell, so will be compatible with these devices. Whether they benefit from the extra range, I do not know.
Yes they are all backwards compatible. N to G to B. BUT, your N network will slow down to G speeds every time the G device connects unless you have a MIMO set up.
It is compatible with Xbox 360, and Xbox live.
Is G compatible network.
Usually they are, you have configure the router for G wireless networks.
Yes. Wireless N routers are backward-compatible with wireless G cards. You will not get the performance benefits of N though.
Wireless routers are OS-independent. Thus just get a good wireless routers with N compatibility.
If you have a wireless adapters, most PCs do not have them, it means that your PC is wireless compatible. Even if you do not have it. It's very easy to fix. You can for $30-50 a good G-card which will allow you to connect to wireless networks (even to N-network, if the the network was configured to work in compatible mode).
Wireless g are only compatible with b. When you shop for a router you will see on the package what that model is compatible with. It will 802.11b/g or 802.11a/n or what ever one you are looking at.