DOS/32 Advanced DOS Extender - Programmer's Reference
2.27 - DPMI function 0304h - Free Real Mode Callback Address
Releases a real mode callback address that was previously allocated with the Allocate Real Mode Callback Address DPMI function 0303h.
||AX = 0304h
CX:DX = real mode callback address to be freed
AX = error code
8024h - invalid callback address
a) Real mode callbacks are a limited system resource. Client should release any callback that it is no longer using.
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