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IN: - OUT, if call successful: Fc =3D 0 HL =3D process handle =09 B =3D 1, always OUT, if call failed: Fc =3D 1 A =3D RC_ROOM, no room to stack process information Registers changed after return: ...CDE../IXIY same AFB...HL/.... different
Internal operating system usage.
Process handle contains the stacked process environment pointers. The he= lp flags refers to the help front DOR if existing.
A stacked process environment consists of:
stack pointer&n= bsp; SP stack frame &nb= sp; at [SP;ST.END] registers  = ; part of stack static workspace&nbs= p; part of stack handles &= nbsp; part of stack segment registers&nb= sp; described by USRSG0/1/2 windows map(s) return PC  = ; RESUME (in OS_In)
OS_Poll, poll for =
an application
DC_Po=
l, poll for card usage
OS_Ent, enter an application
DC_Ent, enter new application
DC_Nam, name current application
<=
a href=3D"/wiki/spaces/DN/pages/7471568" data-linked-resource-id=3D"7471568=
" data-linked-resource-version=3D"4" data-linked-resource-type=3D"page">OS_=
Exit, exit an application
OS_Bye, exit application
DC_Bye, exiting current application
OS_Use, process ca=
rd usage