Abstract: Radio frequency identification (RFID) tags are selected for inventorying using a combination of preselect and/or post select criteria. The selection commands can be for selecting according to a tag memory content, by invoking the mask address or by comparing other tag characteristics. Selection criteria can be determined locally at a modem block of a reader or provided to the modem block by higher layers of the reader. Tags meeting the selection criteria are reported to the higher layers for further actions. Some tags may be held while waiting for instructions from the higher layer block(s). The instructions may involve one or more access operations, which may be performed using a higher transmit power than other operations.