No, the wireless feature in Cain and Abel can not do APR Poisoning, and in order to monitor network activity in such a way that you can see who is doing what, you need to perform APR poisoning, then you select the computer and the router, thus enabling you to sniff all traffic between the two nodes on the network, anything that goes from the target computer to the router WILL first pass trough your computer, then your computer will send the data to the router, and vise versa for data from the router to the target computer... The wireless cracker and sniffer on Cain and Abel only enables you to sniff packets on a WEP or WPA encrypted WLAN network using a AirPcap USB wireless dongle, once you have enough packets you can perform a brute force attack on the ecryption, but with WPA you will first have to inject a Deauth attack on the network to deauthenticae all the users and then they automatically reauthenticate thus giving you the password hash, now with WPA you can only perform dictionary attacks and not brute force. To sniff network activity you must be on a LAN. The best program to sniff LAN activity is Cain and Abel, the best program for Wireless is Aircrack-ng and its compatible with most WLAN cards, I suggest if you buy a card, make sure its chipset is atheros because atheros chipset is compatible with Aireplay, Aireplay is the app you use to inject packets on the WLAN. I hope this cleared things up a bit?