Ad-Hoc and Master mode for Wireless

Hi in my aplication, I need the ConnectCore aplication to act as a AP.
If I put
iwconfig wlan0 essid MarkU mode Master
command didnt complain, and the iwconfig command return that the module is in Master mode of operation…But 10 sec later it show the Managed mode again.

Basicaly I need a remote computer to connect directly to the module, because its not near to an access point. So Ad-Hoc or Master mode will fit.