DOS Interrupts 1Eh and 2Eh

[Bill Wilson]

I am looking for information on two undocumented DOS interrupts.
1Eh and 2Eh are supposedly able to allow a programmer to change
the master environment, i.e. alter the path or setup strings of
the master and not the child process.  If you have any docs on
what registers etc. to fill to execute these interrupts please
send them to me or post them on the net.  I am especially
interested in their use from Turbo C.

Bill Wilson