One of the more powerful features available to LabelVision applications
is their ability to call DOS programs during the print process.
In fact, LabelVision Professional ships with DOS programs for calculating
checksums, logging data, etc.
Normally, when the Print Program calls a DOS program, it "swaps"
itself out of DOS memory (either to disk or to EMS memory), which
frees up all but about 5K of DOS memory for the DOS program. This
swapping is necessary when calling any DOS program that requires
more than about 50K or so of memory.
This swapping does take time. Applications which run a small DOS
program will run faster if you disable swapping. The time savings
is especially significant if your application repeatedly runs the
To disable swapping, specify the /X NOSWAP option on the command
line when you call the print program. If you access your application
from a LabelVision menu, simply add "/X NOSWAP" to the
beginning of the "Options" box in the Menu Editor's "Define
Action" dialog box.
If you start your application from a DOS batch file, add "/X
NOSWAP" to the LPRINT command line. The final line will be
something like that shown below:
LPRINT /X NOSWAP /L myapp