INT 2A - NetSoft DOS-NET v1.20+ - INSTALLATION CHECK
AX = 4147h ('AG')
DX = 0000h
Return: DX = 4147h if installed
DS:SI -> configuration data (see #02554)
Program: DOS-NET is a shareware networking package by Albert Graham
Note: this call is supported by CLIENT.COM, SERVER.COM, ROUTER.COM, and
NETDOS.COM
SeeAlso: INT 65/DX=4147h,INT 65/DX=4741h