INT 1A - TheGrab v4.60 - INSTALLATION CHECK                                     
	AX = E11Dh
Return: ES:DI -> signature block (see #01261) if installed
	    CX = length of signature block (000Fh)
Program: TheGrab is a resident ANSI screen grabber bundled with TheDraw
SeeAlso: AX=E11Bh


Format of TheGrab signature block:
Offset	Size	Description	(Table 01261)
 00h	BYTE	08h
 01h  8 BYTEs	ASCIZA NUL-terminated ASCII string.	The ASCIZ string "ABC" consists of the four bytes 41h, 42h, 43h, and 00h.  Unless otherwise specified, maximum lengths given in the interrupt list do not include the terminating NUL. "THEGRAB"
 09h  6 BYTEs	??? (zeros)