Windows does have an analogue for /dev/stdout, CON:
I imagine it still works, considering Microsoft's ongoing "legacy compatibility" program.
Ah.. found it. Microsoft Support gives a list of reserved names. You cannot name a file these names, and they have special meanings when used as inputs or outputs.
You MIGHT be able to use CON as an output device to send to stdout.
CON Keyboard and display
PRN System list device, usually a parallel port
AUX Auxiliary device, usually a serial port
CLOCK$ System real-time clock
NUL Bit-bucket device
A:-Z: Drive letters
COM1 First serial communications port
LPT1 First parallel printer port
LPT2 Second parallel printer port
LPT3 Third parallel printer port
COM2 Second serial communications port
COM3 Third serial communications port
COM4 Fourth serial communications port