Messync (call target)

Signature:

void messync(int windowId, int boolVal); // id: 0x0011
//or in a context of another script
void scriptName.messync(int windowId, int boolVal); // id: 0x0011

Blocks until window is dismissed.

boolVal - argument purpose unknown, further checks required; original scripts use only 0 (rarely) and 1 (very often)