Compatibility: 5.0+
Expects: AX    4800H
Returns: AL    status: 00H = Doskey is not installed
else= Doskey is installed
Info: Checks to see if the DOS 5.0+ DOSKEY.COM keyboard utility has
been installed and is resident in memory.

The only access to Doskey services is via INT 2fH 4810H, which
will get a line of text input (using Doskey editing keys) and
expand a string of text into its Doskey-macro equivalent.

See Also: INT 2fH 48xxH (Doskey Functions)
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INT 2fH 4800H: Is DOSKEY.COM Installed?