!short: CURDIR()       Return the current DOS directory
!file:C5G0_001.EHO:CURDIR()
!short: DOSERROR()     Return the last DOS error number
!file:C5G0_001.EHO:DOSERROR()
!short: OS()           Return the operating system name
!file:C5G0_001.EHO:OS()
!short: RUN            Execute a DOS command or program
!file:C5G0_002.EHO:RUN

