It involves a few lines of code but there is a way to execute a DOS program
from a LabTalk script and then have the script wait until the DOS program
terminates before continuing with the next script command. First, you must
make a DOS batch file (DosProg.bat) that executes your DosProg.exe and
creates an Origin OGS file that sets a done flag equal to 1 after DosProg.exe
is done executing. For example, create a file named DosProg.bat that
contains the commands:

@echo off
echo [DoneYet] > C:\Origin50\Wait.ogs
echo done=0; >> C:\Origin50\Wait.ogs
start /w C:\Origin50\DosProg.exe
echo done=1; >> C:\Origin50\Wait.ogs
exit

Then, in your LabTalk script place the following lines of code:

// Insert into your script
done=0;
run -e C:\Origin50\DosProg.bat;
for( ;done==0; ) {
sec -p 0.5;
run.section(Wait,DoneYet);
};
// Continue with your script