User`s guide

BDOS FUNCTION 106: SET DEFAULT PASSWORD
Entry Parameters:
Registers C: 6AH
DE: Password Address
Returned Value: none
The Set Default Password function allows a program to specify a password value
before a file protected by the password is accessed. When the file system accesses a
password-protected file, it checks the current DMA, and the default password for the
correct value. If either value matches the file's password, full access to the file is
allowed. Note that this function performs no action in nonbanked CP/M 3 systems
because file passwords are not supported.
To make a Function 106 call, the calling program sets register pair DE to the
address of an 8-byte field containing the password.
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BDOS Function Calls CP/M 3 Programmers Guide