AAL (n)~ The layer of the asynchronous transfer mode (ATM) protocol stack that parses data into the payload portion of the ATM cell for transport across an ATM network. AAM (n)~ A security feature of Windows that allows administrators to perform normal day-to-day tasks while running with a standard user token. If administrator privileges are needed for an operation the administrator will be notified and asked to provide either consent or credentials depending on system policy settings.