As far as I know, APPEND is considered dangerous and incompatible. It had better stay missing.
Well, it is not aware of task switchers, it may have problems with executing nested SHELLs, true. Many reasons why MS does NOT support it. Anyway I am giving a try, as it was VERY useful to me: it allowed me to run WordStar Express on my PC/XT having two DD drives: 3 1/2 and 5 1/4...
Here is what 4DOS authors (Rex Conn & JP Software) think about APPEND (from their help file):
CAUTION: In our opinion APPEND is a dangerous command. It is capable of "fooling" programs into thinking they are accessing one file when they are really accessing another one with the same name in a different directory. This can either do just what you want, or cause all sorts of trouble, depending on the circumstances. In particular, this behaviour can cause 4DOS to place desfriptions which go with files in one directory in the description file for another directory, because with APPEND running 4DOS can't tell whether APPEND has opened a file different from the one it asked for.
Lucho
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