The Aerco system does not presently support commands which have variable names or addresses when loading or saving disc files. These include commands such as CAT “at.bin”, or MOVE “at.bin”,y,L where the variables for the name, a$, the beginning address, y. and the program length, L, have all previously been specified in the program. Almost any program in which the user generates files needs to make use of commands of this type. That includes word processors, data bases, spread sheets, graphics programs, and others. Aerco has said that they will attempt to incorporate that facility in future EPROMS and boot discs, but the date for this is indeterminate.