Register parameters
RST 20H, DEFW $DE06
IN:
A = Tri-handle subtype
TH_FILT ($F0), free filter handle
TH_WMG ($F1), free wildcard manager handle
TH_ALM ($F2), free alarm handle
IX = tri-handle
OUT, if call successful:
Fc = 0, handle freed
IX = 0
BHL = Tri-handle contents
OUT, if call failed:
Fc = 1
A = RC_HAND, bad handle
Registers changed after return:
...CDE../..IY same
AFB...HL/IX.. different
Notes
Internal operating system usage.