A device sends an interrupt request to the CPU over these hardware lines, causing the processor to stop what it's doing and jump to a routine that handles the device's needs. If two devices that don't support sharing are attempting to use an IRQ, they can crash the system. PC systems have 16 IRQs available, several of which are necessarily used by the keyboard, the floppy and hard disk controllers, the printer port, and the communications port. IRQs shows the IRQ assignments for all devices, as well as which IRQs are free, if any. This information lets you force a device to take a specific IRQ by changing its jumper settings or assigning the IRQ to that device via the Device Manager in Control Panel's System utility.
Memory lists the assigned memory ranges for a system's hardware devices.
Again, the purpose is to help determine conflicts and to help you see which memory ranges you can specify for a device by altering that device's properties using the Device Manager.