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 Introduction        Introduction to disk functions
 DELETEFILE()        Erase specified file
 DIRCHANGE()         Check directory, change directory
 DIRMAKE()           Create new directory
 DIRNAME()           Establish directory name
 DIRREMOVE()           Remove a subdirectory
 DISKCHECK()         Check sum all disk data
 DISKFREE()          Establish diskette storage capacity
 DISKNAME()          Determine drive designator
 DISKREADY()         Await disk change
 DISKREADYW()        Check drive status
 DISKTOTAL()         Check disk capacity for backup
 DISKSTAT()          Establish error cause
 DISKTYPE()          Test diskette type
 DRIVETYPE()         Check disk type: hard/floppy/RAM
 FILECHECK()         Check file changes
 FILEDELETE()        Erase files
 FILEMOVE()          Move a file
 NUMDISKF()          Determine number of disk drives
 NUMDISKL()          Return available drives
 TEMPFILE()          Denote temporary file name