what does InstallExecute Action do in msi?

Does it execute items in InstallExecute开发者_开发技巧Sequence table sequentially? I see sth. like this in install log and I am confused what table InstallExecute executes against? Also what is Action 15:48:47: ProcessComponents. Updating component registration 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} 2: {94DCED2E-5034-7B30-03CD-BF63F53C869D}

thanks

Action 15:48:47: InstallExecute. Action start 15:48:47: InstallExecute. Action 15:48:47: InstallInitialize. 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} MSI (s) (C4:4C) [15:48:47:266]: Using cached product context: machine assigned for product: AD5E1768E9E39694DAC9E971AD4D77CC Action 15:48:47: ProcessComponents. Updating component registration 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} 2: {94DCED2E-5034-7B30-03CD-BF63F53C869D} 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} 2: {E6FAF90D-E579-7127-A024-75C0DAE21B20} 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} 2: {DEDF744A-0541-016D-880A-0D25C529288F} 1: {8671E5DA-3E9E-4969-AD9C-9E17DAD477CC} 2: {0162CD05-78C6-F699-FD7D-DE0519D14C35}