Just wondering if anyone know what the syntax is for running a system command from within a VB program (for instance, say I want to run the program blah.exe from within my VB program . . . how would i go about doing this?)

Also, anyone know how to make a dialog system modal (like in VC++ where the user cannot use other programs without first finishing with the system modal program. . . for instance, if i wanted to write a password app and didn't want the user to be able to use any other programs without first entering the correct password and kiling the dialog...
Regards