wD
Window disable.
RD CM registers
GRD NM general registers
SRD NM special registers
PD Program, current mode
CMPD CM program
NMPD NM program
QD CM frame, Q relative
SD CM stack, S relative
GD Group window
UD [win_number] User window
VD [win_number] Virtual window
ZD Real memory window
LD LDEV window
TXD [win_number] Text window