The command line version of Dataplot is built using the Intel Fortran (previously the Microsoft) compiler as a QuickWin (QWIN) application. By default, the SYSTEMQQ library routine is used to invoke operating system commands and external programs. The primary drawback of this option is that control does not return to Dataplot until the operating system command completes execution.
Alternatively, the WinExec function can be used. The advantage of this method is that control passes back to Dataplot after the command is issued (i.e., it doesn't wait for the command to complete). However, the drawback is that DOS type commands do not work.
The basic recommendation is that if you want to execute a Windows application (e.g., the browser, notepad, Word, etc.), then set this option to WINEXEC. However, to issue a DOS type command via the Dataplot SYSTEM command, you should set this option to SYSTEMQQ (the default).
In particular, I recommend setting this option to WINEXEC before using the WEB HELP (or any other command starting with WEB) command.
This allows you to enter additional Dataplot commands without exiting the browser.
SET QWIN SYSTEM SYSTEMQQ
SET QWIN SYSTEM WINEXEC WEB HELP PLOT SET QWIN SYSTEM SYSTEMQQ SYSTEM DIR C:\DATAPLOT\DATA | MORE