MOV AX,B800H ;AX - function code
INT 2FH ;Call function
CMP AL,0 ;Is network installed?
JE NOT_INSTALLED ;No, network not installed.
TEST BX,RECEIVER_FLAG ;Is Receiver installed?
JNZ RECEIVER_STARTED ;Yes, Receiver is installed.
TEST BX,REDIRECTOR_FLAG ;Is Redirector installed?
JNZ REDIRECTOR_STARTED ;Yes, Redirector is installed.

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