The following table lists the MMIO services provided by internal I/O procedures:
┌──────────────────┬────────────────────────────────────┐ │IOProc │Description │ ├──────────────────┼────────────────────────────────────┤ │DOS │Handles standard OS/2 disk files. │ ├──────────────────┼────────────────────────────────────┤ │MEM (memory) │Manages memory files without │ │ │accessing the file system. │ │ │A memory file is a block of memory │ │ │that is perceived as a file to an │ │ │application. This unifies the │ │ │interface for applications that │ │ │access both files and memory. │ ├──────────────────┼────────────────────────────────────┤ │CF (compound file)│Supports the RIFF compound file │ │ │format. │ │ │The CF IOProc operates on a compound│ │ │file. The MMIO Manager provides │ │ │services to find, query, and access │ │ │file elements in a compound file. │ │ │It also supports the function of │ │ │file compaction. │ └──────────────────┴────────────────────────────────────┘