TSR programs

Microsoft's WINSTART.BAT file is a batch file that predates Windows 95 and was documented in the Windows 3.1 Resource Kit. Its primary function is to load terminate-and-stay-resident (TSR) programs for use by Windows applications, while these TSRs are not accessible to individual MS-DOS virtual machines. WINSTART.BAT is executed after the virtual machine manager (VMM) initializes, giving it an advantage over AUTOEXEC.BAT, which runs during the MS-DOS startup phase. TSRs loaded via AUTOEXEC.BAT are available to both Windows and MS-DOS environments, while those loaded through WINSTART.BAT are limited to Windows applications only.